History Of Sony

Sony Corporation (ソニー株式会社 Sonī Kabushiki Gaisha?), commonly referred to as Sony, is a Japanese multinational conglomerate corporation headquartered in Kōnan Minato, Tokyo, Japan. Its diversified business is primarily focused on the electronics (TV, gaming consoles, refrigerators), game, entertainment and financial services sectors. The company is one of the leading manufacturers of electronic products for the consumer and professional markets. Sony is ranked 105th on the 2014 list of Fortune Global 500.

Sony Corporation is the electronics business unit and the parent company of the Sony Group, which is engaged in business through its four operating segments – electronics (including video games, network services and medical business), motion pictures, music and financial services. These make Sony one of the most comprehensive entertainment companies in the world. Sony's principal business operations include Sony Corporation (Sony Electronics in the U.S.), Sony Pictures Entertainment, Sony Computer Entertainment, Sony Music Entertainment, Sony Mobile Communications (formerly Sony Ericsson), and Sony Financial. Sony is among the Worldwide Top 20 Semiconductor Sales Leaders and as of 2013, the fourth-largest television manufacturer in the world, after Samsung Electronics, LG Electronics and TCL.

The Sony Group (ソニー・グループ Sonī Gurūpu?) is a Japan-based corporate group primarily focused on the Electronics (such as AV/IT products and components), Game (such as the PlayStation), Entertainment (such as motion pictures and music), and Financial Services (such as insurance and banking) sectors. The group consists of Sony Corporation (holding and electronics), Sony Computer Entertainment (games), Sony Pictures Entertainment (motion pictures), Sony Music Entertainment (music), Sony/ATV Music Publishing (music publishing), Sony Financial Holdings (financial services) and others.

Its founders Akio Morita and Masaru Ibuka derived the name from sonus, the Latin word for sound, and also from the English slang word "sonny", since they considered themselves to be "sonny boys", a loan word into Japanese which in the early 1950s connoted smart and presentable young men.The company's current slogan is BE MOVED. Their former slogans were make.believe (2009–2014) and like.no.other (2005–2014).

Tokyo Tsushin Kogyo

Sony began in the wake of World War II. In 1946, Masaru Ibuka started an electronics shop in a department store building in Tokyo. The company had $530 in capital and a total of eight employees.In the following year he was joined by his colleague, Akio Morita, and they founded a company called Tokyo Tsushin Kogyo (Tokyo Telecommunications Engineering Corporation). The company built Japan's first tape recorder, called the Type-G.In 1958 the company changed its name to "Sony".

Sony name change

When Tokyo Tsushin Kogyo was looking for a romanized name to use to market themselves, they strongly considered using their initials, TTK. The primary reason they did not is that the railway company Tokyo Kyuko was known as TTK. The company occasionally used the acronym "Totsuko" in Japan, but during his visit to the United States, Morita discovered that Americans had trouble pronouncing that name. Another early name that was tried out for a while was "Tokyo Teletech" until Akio Morita discovered that there was an American company already using Teletech as a brand name.

The name "Sony" was chosen for the brand as a mix of two words. One was the Latin word "Sonus", which is the root of sonic and sound, and the other was "Sonny", a familiar term used in 1950s America to call a boy. The first Sony-branded product, the TR-55 transistor radio, appeared in 1955 but the company name did not change to Sony until January 1958.

At the time of the change, it was extremely unusual for a Japanese company to use Roman letters to spell its name instead of writing it in kanji. The move was not without opposition: TTK's principal bank at the time, Mitsui, had strong feelings about the name. They pushed for a name such as Sony Electronic Industries, or Sony Teletech. Akio Morita was firm, however, as he did not want the company name tied to any particular industry. Eventually, both Ibuka and Mitsui Bank's chairman gave their approval.

Globalization

According to Schiffer, Sony's TR-63 radio "cracked open the U.S. market and launched the new industry of consumer microelectronics." By the mid-1950s, American teens had begun buying portable transistor radios in huge numbers, helping to propel the fledgling industry from an estimated 100,000 units in 1955 to 5 million units by the end of 1968.

Sony co-founder Akio Morita founded Sony Corporation of America in 1960. In the process, he was struck by the mobility of employees between American companies, which was unheard of in Japan at that time. When he returned to Japan, he encouraged experienced, middle-aged employees of other companies to reevaluate their careers and consider joining Sony. The company filled many positions in this manner, and inspired other Japanese companies to do the same. Moreover, Sony played a major role in the development of Japan as a powerful exporter during the 1960s, 1970s, and 1980s. It also helped to significantly improve American perceptions of "made in Japan" products.Known for its production quality, Sony was able to charge above-market prices for its consumer electronics and resisted lowering prices.

In 1971, Masaru Ibuka handed the position of president over to his co-founder Akio Morita. Sony began a life insurance company in 1979, one of its many peripheral businesses. Amid a global recession in the early 1980s, electronics sales dropped and the company was forced to cut prices.[16] Sony's profits fell sharply. "It's over for Sony," one analyst concluded. "The company's best days are behind it." Around that time, Norio Ohga took up the role of president. He encouraged the development of the Compact Disc in the 1970s and 1980s, and of the PlayStation in the early 1990s. Ohga went on to purchase CBS Records in 1988 and Columbia Pictures in 1989, greatly expanding Sony's media presence. Ohga would succeed Morita as chief executive officer in 1989.

Under the vision of co-founder Akio Morita and his successors, the company had aggressively expanded into new businesses. Part of its motivation for doing so was the pursuit of "convergence," linking film, music, and digital electronics via the Internet. This expansion proved unrewarding and unprofitable, threatening Sony's ability to charge a premium on its products as well as its brand name. In 2005, Howard Stringer replaced Nobuyuki Idei as chief executive officer, marking the first time that a foreigner had run a major Japanese electronics firm. Stringer helped to reinvigorate the company's struggling media businesses, encouraging blockbusters such as Spider-Man while cutting 9,000 jobs.He hoped to sell off peripheral business and focus the company again on electronics.Furthermore, he aimed to increase cooperation between business units, which he described as "silos" operating in isolation from one another. In a bid to provide a unified brand for its global operations, Sony introduced a slogan known as "make.believe" in 2009.

Despite some successes, the company faced continued struggles in the mid- to late-2000s. In 2012, Kazuo Hirai was promoted to president and CEO, replacing Sir Howard Stringer. Shortly thereafter, Hirai outlined his company-wide initiative, named "One Sony" to revive Sony from years of financial losses and bureaucratic management structure, which proved difficult for former CEO Stringer to accomplish, partly due to differences in business culture and native languages between Stringer and some of Sony's Japanese divisions and subsidiaries. Hirai outlined three major areas of focus for Sony's electronics business, which include imaging technology, gaming and mobile technology, as well as a focus on reducing the major losses from the television business.

In February 2014, Sony announced the sale of its Vaio PC division to a new corporation owned by investment fund Japan Industrial Partners and spinning its TV division into its own corporation as to make it more nimble to turn the unit around from past losses totaling $7.8 billion over a decade. Later that month, they announced that they would be closing 20 stores. In April, the company announced that they would be selling 9.5 million shares in Square Enix (roughly 8.2 percent of the game company's total shares) in a deal worth approximately $48 million. In May 2014 the company announced it was forming two joint ventures with Shanghai Oriental Pearl Group to manufacture and market Sony's PlayStation games consoles and associated software in China.

In February 2015, Sony announced that it may spin-off its audio and video business as a separate company by October. Kazuo Hirai also said that Sony would focus on its most profitable businesses, such as PlayStation and film and television production, and that it may seek to spin-off or close other under-performing divisions.

History Of Lenovo

Lenovo Group Ltd. /lɛnˈoʊvoʊ/ is a Chinese multinational computer technology company with headquarters in Beijing, China, and Morrisville, North Carolina, United States. It designs, develops, manufactures and sells personal computers, tablet computers, smartphones, workstations, servers, electronic storage devices, IT management software and smart televisions. In 2014, Lenovo was the world's largest personal computer vendor by unit sales. It markets the ThinkPad line of notebook computers and the ThinkCentre line of desktops.

Lenovo has operations in more than 60 countries and sells its products in around 160 countries. Lenovo's principal facilities are in Beijing, Morrisville and Singapore, with research centers in those locations, as well as Shanghai, Shenzhen, Xiamen, and Chengdu in China, and Yamato in Kanagawa Prefecture, Japan. It operates a joint venture with EMC, LenovoEMC, which sells network-attached storage solutions. It also has a joint venture with NEC, Lenovo NEC Holdings, which produces personal computers for the Japanese market.

Lenovo was founded in Beijing in 1984 as Legend and was incorporated in Hong Kong in 1988. Lenovo acquired IBM's personal computer business in 2005 and agreed to acquire its Intel-based server business in 2014. Lenovo entered the smartphone market in 2012 and as of 2014 is the largest vendor of smartphones in Mainland China. In January 2014, Lenovo agreed to acquire the mobile phone handset maker Motorola Mobility from Google, and in October 2014 the deal was finalized.

Lenovo is listed on the Hong Kong Stock Exchange and is a constituent of the Hang Seng China-Affiliated Corporations Index, often referred to as "Red Chips."

Founding and early history

Liu founded Lenovo in 1984 with a group of ten engineers in Beijing with 200,000 yuan. Lenovo officially states that it was founded on 1 November 1984. Lenovo's incorporation was approved by the Chinese government on the same day. Jia Xufu, one of the founders of Lenovo, indicates the first meeting in preparation for starting the company was held on 17 October of the same year. Eleven people, the entirety of the initial staff, attended. Each of the founders were middle-aged members of the Institute of Computing Technology, Chinese Academy of Sciences. The 200,000 yuan used as start-up capital was approved by Zeng Maochao. The name for the company agreed upon at this meeting was the Chinese Academy of Sciences Computer Technology Research Institute New Technology Development Company.

Their first significant effort, an attempt to import televisions, failed. The group rebuilt itself within a year by conducting quality checks on computers for new buyers. Lenovo soon started developing a circuit board that would allow IBM-compatible personal computers to process Chinese characters. This product was Lenovo's first major success. Lenovo also tried and failed to market a digital watch. Liu said, "Our management team often differed on which commercial road to travel. This led to big discussions, especially between the engineering chief and myself. He felt that if the quality of the product was good, then it would sell itself. But I knew this was not true, that marketing and other factors were part of the eventual success of a product." Lenovo's early difficulties were compounded by the fact that its staff had little business experience. "We were mainly scientists and didn't understand the market," Liu said. "We just learned by trial-and-error, which was very interesting—but also very dangerous," said Liu. In 1990, Lenovo started to manufacture and market computers using its own brand name.

In May 1988, Lenovo placed its first advertisement seeking employees. The ad was placed on the front page of the China Youth News, and it was quite rare in China at that time. Out of the 500 respondents, 280 were selected to take a written employment exam. 120 of these candidates were interviewed in person. Although interviewers initially only had authority to hire 16 people, 58 were given offers. The new staff included 18 people with graduate degrees, 37 with undergraduate degrees, and three students with no university-level education. Their average age was 26. Yang Yuanqing, the current CEO of Lenovo, was among that group.

Liu Chuanzhi, received government permission to open a subsidiary in Hong Kong and was allowed to move there along with five other employees. Liu's father, already in Hong Kong, furthered his son's ambitions through mentoring and facilitating loans. Liu moved to Hong Kong in 1988. In order to save money during this period, Liu and his co-workers walked instead of taking public transportation. In order to keep up appearances, they rented hotel rooms for meetings.

History Of Hewlett-Packard

Hewlett-Packard Company or HP (styled as hp) is an American multinational information technology company headquartered in Palo Alto, California, United States. It provides hardware, software and services to consumers, small- and medium-sized businesses (SMBs) and large enterprises, including customers in the government, health and education sectors.

The company was founded in a one-car garage in Palo Alto by William "Bill" Redington Hewlett and David "Dave" Packard starting with a line of electronic test equipment. HP was the world's leading PC manufacturer from 2007 to Q2 2013, after which Lenovo remained ranked ahead of HP. It specializes in developing and manufacturing computing, data storage, and networking hardware, designing software and delivering services. Major product lines include personal computing devices, enterprise and industry standard servers, related storage devices, networking products, software and a diverse range of printers and other imaging products. HP markets its products to households, small- to medium-sized businesses and enterprises directly as well as via online distribution, consumer-electronics and office-supply retailers, software partners and major technology vendors. HP also has services and consulting business around its products and partner products.

Hewlett-Packard company events have included the spin-off of its electronic and bio-analytical measurement instruments part of its business as Agilent Technologies in 1999, its merger with Compaq in 2002, the sponsor of Mission: Space in 2003, and the acquisition of EDS in 2008, which led to combined revenues of $118.4 billion in 2008 and a Fortune 500 ranking of 9 in 2009. In November 2009, HP announced the acquisition of 3Com, with the deal closing on April 12, 2010. On April 28, 2010, HP announced the buyout of Palm, Inc. for $1.2 billion. On September 2, 2010, HP won its bidding war for 3PAR with a $33 a share offer ($2.07 billion), which Dell declined to match.

On October 6, 2014, Hewlett-Packard announced plans to split the PC and printers business from its enterprise products and services business. The split is expected to close by October 2015 and will result in two publicly traded companies: Hewlett Packard Enterprise and HP Inc.

Founding

The garage in Palo Alto where Hewlett and Packard began their company Bill Hewlett and Dave Packard graduated with degrees in electrical engineering from Stanford University in 1935. The company originated in a garage in nearby Palo Alto during a fellowship they had with a past professor, Frederick Terman at Stanford during the Great Depression. Terman was considered a mentor to them in forming Hewlett-Packard. In 1939, Packard and Hewlett established Hewlett-Packard (HP) in Packard's garage with an initial capital investment of US$538. Hewlett and Packard tossed a coin to decide whether the company they founded would be called Hewlett-Packard or Packard-Hewlett. HP incorporated on August 18, 1947, and went public on November 6, 1957.

Of the many projects they worked on, their very first financially successful product was a precision audio oscillator, the Model HP200A. Their innovation was the use of a small incandescent light bulb (known as a "pilot light") as a temperature dependent resistor in a critical portion of the circuit, the negative feedback loop which stabilized the amplitude of the output sinusoidal waveform. This allowed them to sell the Model 200A for $54.40 when competitors were selling less stable oscillators for over $200. The Model 200 series of generators continued until at least 1972 as the 200AB, still tube-based but improved in design through the years.

One of the company's earliest customers was Walt Disney Productions which bought eight Model 200B oscillators (at $71.50 each) for use in certifying the Fantasound surround sound systems installed in theaters for the movie Fantasia.

History Of Acer

Acer Inc. (/ˈeɪsər/; Chinese: 宏碁股份有限公司; pinyin: Hóngqi Gǔfèn Yǒuxiàn Gōngsī, lit. Hongqi Corporation) (stylized as acer, or formerly as acer) is a Taiwanese multinational hardware and electronics corporation specializing in advanced electronics technology and is headquartered in Xizhi, New Taipei City, Taiwan. Acer's products include desktop and laptop PCs, tablet computers, servers, storage devices, displays, LED, LCD and plasma televisions, smartphones and peripherals. It also provides e-business services to businesses, governments and consumers. In 2014 Acer was the fourth-largest personal computer vendor in the world. In the early 2000s, Acer implemented a new business model, shifting from a manufacturer to a designer, marketer and distributor of products, while performing production processes via contract manufacturers. In addition to its core business, Acer owns the largest franchised computer retail chain in Taipei, Taiwan.

Acer was founded by Stan Shih (施振榮), his wife Carolyn Yeh, and a group of five others as Multitech in 1976, headquartered in Hsinchu City, Taiwan.

It began with eleven employees and US$25,000 in capital. Initially, it was primarily a distributor of electronic parts and a consultant in the use of microprocessor technologies. It produced the Micro-Professor MPF-I training kit, then two Apple II clones; the Microprofessor II and III before joining the emerging IBM PC compatible market, and becoming a significant PC manufacturer. The company was renamed Acer in 1987.

Growth and netbook raise

Acer increased worldwide sales while simultaneously reducing its labor force by identifying and using marketing strategies that best utilized their existing distribution channels. By 2005, Acer employed a scant 7,800 people worldwide. Revenues rose from US$4.9 billion in 2003 to US$11.31 billion in 2006.

Acer's North American market share has slipped over the past few years, while in contrast, the company's European market share has risen.

In the mid-2000s years, consumer notebooks have been almost the sole growth drivers for the PC industry, and Acer's exceptionally low overheads and dedication to the channel had made it one of the main beneficiaries of this trend. Acer grew quickly in Europe in part by embracing the use of more traditional distribution channels targeting retail consumers when some rivals were pursuing online sales and business customers. In 2007 Acer bought Gateway in the USA and Packard Bell in Europe and became the Number 3 world provider of computers and number 2 for notebooks, and achieved significant improvement in profitability. Acer has been striving to become the world`s largest PC vendor, in the belief that the goal can help it achieve economy of scale and garner higher margin. But such a reliance on the high-volume, low-value PC market made Acer exposed when buying habits changed.

2013 re-organization

On November 2013 Chairman and CEO J.T. Wang, and President Jim Wong, both resigned due to the company's bad financial performance. Wang had already been reportedly due to leave Acer at year's end to be replaced by Wong. Acer founder Stan Shih has taken over as board chairman and interim president as the company searches for a new candidate to assume the role of presidency. The position of CEO will be eliminated and its responsibilities transferred to the chairman or president, according to Acer in order to improve decision-making efficiency. On December 23 Acer named Jason Chen, vice president of worldwide sales and marketing at Taiwan Semiconductor Manufacturing, as its new president and CEO, effective Jan. 1. Entertainment industry executive and former actress Nancy Hu was named CFO and Spokesperson as of May 1, 2014.

History Of ASUS

ASUSTeK Computer Inc. (simplified Chinese: 华硕电脑股份有限公司; traditional Chinese: 華碩電腦股份有限公司; pinyin: Huáshuò Diànnǎo Gǔfèn Yǒuxiàn Gōngsī), usually referred to as ASUS (/ˈeɪsuːs/) and in Chinese Huáshuò (simplified Chinese: 华硕; traditional Chinese: 華碩), and trading under that name, is a Taiwanese multinational computer hardware and electronics company headquartered in Beitou District, Taipei, Taiwan. Its products include desktops, laptops, netbooks, LED/LCD panels, mobile phones, networking equipment, monitors, motherboards, graphics cards, optical storage, multimedia products, servers, workstations, and tablet PCs. The company's slogan/tagline was "Rock Solid. Heart Touching", then "Inspiring Innovation. Persistent Perfection." and is currently "In Search of Incredible."

ASUS is the world's fifth-largest PC vendor by 2014 unit sales (after Lenovo, HP, Dell and Acer). ASUS appears in BusinessWeek’s "InfoTech 100" and "Asia’s Top 10 IT Companies" rankings, and it ranked first in the IT Hardware category of the 2008 Taiwan Top 10 Global Brands survey with a total brand value of $1.3 billion.

ASUS has a primary listing on the Taiwan Stock Exchange under the ticker code TWSE and a secondary listing on the London Stock Exchange under a ticker code ASKD.

ASUS was founded in Taipei in 1989 by T.H. Tung, Ted Hsu, Wayne Hsieh and M.T. Liao, all four having previously worked at Acer as hardware engineers. At this time, Taiwan had yet to establish a leading position in the computer-hardware business. Intel Corporation would supply any new processors to more established companies like IBM first, and Taiwanese companies would have to wait for approximately six months after IBM received their engineering prototypes. According to the legend, the company created a prototype for a motherboard using an Intel 486, but it had to do so without access to the actual processor. When ASUS approached Intel to request a processor to test it, Intel itself had a problem with their motherboard. ASUS solved Intel's problem and it turned out that ASUS' own motherboard worked correctly without the need for further modification. Since then, ASUS was receiving Intel engineering samples ahead of its competitors.

In September 2005 ASUS released the first PhysX accelerator card. In December 2005 ASUS entered the LCD TV market with the TLW32001 model. In January 2006 ASUS announced that it would cooperate with Lamborghini to develop the VX series.

On 9 March 2006 ASUS was confirmed as one of the manufacturers of the first Microsoft Origami models, together with Samsung and Founder Technology. On 8 August 2006 ASUS announced a joint venture with Gigabyte Technology. On 5 June 2007 ASUS announced the launch of the Eee PC at COMPUTEX Taipei. On 9 September 2007 ASUS indicated support for Blu-ray, announcing the release of a BD-ROM/DVD writer PC drive, BC-1205PT. ASUS subsequently released several Blu-ray based notebooks.

In January 2008, ASUS began a major restructuring of its operations, splitting into three independent companies: ASUS (focused on applied first-party branded computers and electronics); Pegatron (focused on OEM manufacturing of motherboards and components); and Unihan Corporation (focused on non-PC manufacturing such as cases and molding).In the process of the restructuring, a highly criticized pension-plan restructuring effectively zeroed out the existing pension balances. The company paid out all contributions previously made by employees.

On 9 December 2008, the Open Handset Alliance announced that ASUS had become one of 14 new members of the organization. These "new members will either deploy compatible Android devices, contribute significant code to the Android Open Source Project, or support the ecosystem through products and services that will accelerate the availability of Android-based devices."

On 1 June 2010, ASUS spun off Pegatron Corp. In October 2010, ASUS and Garmin announced that they would be ending their smartphone partnership as a result of Garmin deciding to exit the product category. The two companies had produced six Garmin-ASUS branded smartphones over the prior two years.

In December 2010, ASUS launched the world's thinnest notebook, the ASUS U36, with Intel processor voltage standard (not low voltage) Intel core i3 or i5 with a thickness of only 19 mm.

In January 2013, ASUS officially ended production of its Eee PC series due to declining sales caused by consumers increasingly switching to tablets and Ultrabooks.

Projector

A projector or image projector is an optical device that projects an image (or moving images) onto a surface, commonly a projection screen.

Most projectors create an image by shining a light through a small transparent lens, but some newer types of projectors can project the image directly, by using lasers. A virtual retinal display, or retinal projector, is a projector that projects an image directly on the retina instead of using an external projection screen.

The most common type of projector used today is called a video projector. Video projectors are digital replacements for earlier types of projectors such as slide projectors and overhead projectors. These earlier types of projectors were mostly replaced with digital video projectors throughout the 1990s and early 2000s (decade), but old analog projectors are still used at some places. The newest types of projectors are handheld projectors that use lasers or LEDs to project images. Their projections are hard to see if there is too much ambient light.

Movie theaters use a type of projector called a movie projector. Another type of projector is the enlarger, a device used to produce photographic prints from negatives.

Early history of projectors and cameras

Projectors share a common history with cameras. As far back as the 4th century BC, Greeks such as Aristotle and Euclid wrote on naturally-occurring rudimentary pinhole cameras. For example, light may travel through the slits of wicker baskets or the crossing of tree leaves. (The circular dapples on a forest floor, actually pinhole images of the sun, can be seen to have a bite taken out of them during partial solar eclipses opposite to the position of the moon's actual occultation of the sun because of the inverting effect of pinhole lenses.)

It was the 10th-century Ibn al-Haytham (Alhazen), who published this idea in the Book of Optics in 1021. When Ibn al-Haytham began experimenting with the camera obscura, he himself stated, Et nos non inventimus ita, "we did not invent this". He improved on the camera after realizing that the smaller the pinhole, the sharper the image (though the less light). He provides the first clear description for construction of a camera obscura (Lat. dark chamber). As a side benefit of his invention, he was credited with being first man to shift physics from a philosophical to an experimental basis.

In the 5th century BC, the Mohist philosopher Mo Jing in ancient China mentioned the effect of an inverted image forming through a pinhole. The image of an inverted Chinese pagoda is mentioned in Duan Chengshi's (died 863) book Miscellaneous Morsels from Youyang written during the Tang Dynasty (618–907). Along with experimenting with the pinhole camera and the burning mirror of the ancient Mohists, the Song Dynasty (960–1279) Chinese scientist Shen Kuo (1031–1095) experimented with camera obscura and was the first to establish geometrical and quantitative attributes for it.

Ancient pinhole camera effect caused by balistrarias in the Castelgrande in Bellinzona

In the 13th century, Robert Grosseteste and Roger Bacon commented on the pinhole camera. Between 1000 and 1600, men such as Ibn al-Haytham, Gemma Frisius, and Giambattista della Porta wrote on the pinhole camera, explaining why the images are upside down. Pinhole devices provide safety for the eyes when viewing solar eclipses because the event is observed indirectly, the diminished intensity of the pinhole image being harmless compared with the full glare of the Sun itself.

The first image projectors

The first known record of what might portray the idea of projecting an image on a surface is a drawing by Johannes de Fontana from 1420. The drawing was of a nun holding something that might be a lantern. The lantern had a small translucent window that contained an image of a devil holding a lance . Leonardo da Vinci also made a similar sketch in 1515. These drawings are likely to have inspired the creation of the earliest image projector, a device called a magic lantern.

In the 17th century, the first magic lantern was developed. With pinhole cameras and camera obscura it was only possible to project an image of actual scene, such as an image of the sun, on a surface. The magic lantern on the other hand could project a painted image on a surface, and marks the point where cameras and projectors became two different kinds of devices. There has been some debate about who the original inventor of the magic lantern is, but the most widely accepted theory is that Christiaan Huygens developed the original device in the late 1650s. However, other sources give credit to the German priest Athanasius Kircher. He describes a device such as the magic lantern in his book Ars Magna Lucis et Umbrae. There are possible mentions of this device associated with Kircher as early as 1646. Even in its earliest use, it was demonstrated with monstrous images such as the Devil. Huygen’s device was even referred to as the “lantern of fright” because it was able to project spooky images that looked like apparitions. In its early development, it was mostly used by magicians and conjurers to project images, making them appear or disappear, transform from one scene into a different scene, animate normally inanimate objects, or even create the belief of bringing the dead back to life. In the 1660s, a man named Thomas Walgensten used his so-called “lantern of fear” to summon ghosts. These misuses of this early machine were not uncommon. In fact, a common setup of the machine was to keep parts of the projector in a separate, adjoining room with only the aperture visible, to make it seem more magical and scare people. By the 18th century, use by charlatans was common for religious reasons. For example, Count Cagliostro used it to ‘raise dead spirits’ in Egyptian masonry. Johann Georg Schröpfer used the magic lantern to conjure up images of dead people on smoke. He staged routines doing this at his coffee shop in Leipzig. He did this to scare people and make them think he was a good actor. Schröpfer ended up going crazy and thinking he himself was pursued by real devils, and shot himself after promising an audience he would later resurrect himself.

vacuum cleaner

A vacuum cleaner is a device that uses an air pump (a centrifugal fan in all but some of the very oldest models), to create a partial vacuum to suck up dust and dirt, usually from floors, and from other surfaces as well. The dirt is collected by either a dustbag or a cyclone for later disposal. Vacuum cleaners, which are used in homes as well as in industry, exist in a variety of sizes and models—small battery-powered hand-held devices, domestic central vacuum cleaners, huge stationary industrial appliances that can handle several hundred litres of dust before being emptied, and self-propelled vacuum trucks for recovery of large spills or removal of contaminated soil.

Although "vacuum cleaner" is a neutral name, in some countries (UK, Ireland) "hoover" is used instead as a genericized trademark, after one of the first and more influential companies in the development of the device, but actually irrespective of the brand used (like kleenex for facial tissue).

History

The vacuum cleaner evolved from the carpet sweeper via manual vacuum cleaners. The first manual models, using bellows, were developed in the 1860s, and the first motorized designs appeared at the turn of the 20th century, with the first decade being the boom decade.

An early hand-pumped vacuum cleaner

In 1860 a carpet sweeper was invented by Daniel Hess of West Union, Iowa that gathered dust with a rotating brush and a bellows for generating suction. Another early model (1869) was the "Whirlwind", invented in Chicago in 1868 by Ives W. McGaffey. The bulky device worked with a belt driven fan cranked by hand that made it awkward to operate, although it was commercially marketed with mixed success. A similar model was constructed by Melville R. Bissell of Grand Rapids, Michigan in 1876.The company later added portable vacuum cleaners to its line of cleaning tools.

The next improvement came in 1898, when John S. Thurman of St. Louis, Missouri, submitted a patent (US No. 634,042) for a "pneumatic carpet renovator". This was a gasoline powered cleaner although the dust was blown into a receptacle rather than being sucked in, as in the machine now used.In a newspaper advertisement from the St. Louis Dispatch, Thurman offered his invention of the horse-drawn (which went door to door) motorized cleaning system in St. Louis. He offered cleaning services at $4 per visit. By 1906 Thurman was offering built-in central cleaning systems that used compressed air, yet featured no dust collection. In later patent litigation, Judge Augustus Hand ruled that Thurman "does not appear to have attempted to design a vacuum cleaner, or to have understood the process of vacuum cleaning"

Vacuum cleaner

"Dedusting pump", circa 1906.

The motorized vacuum cleaner was invented by Hubert Cecil Booth of England in 1901.As Booth recalled decades later, that year he attended "a demonstration of an American machine by its inventor" at the Empire Music Hall in London. The inventor is not named, but Booth's description of the machine conforms fairly closely to Thurman's design, as modified in later patents. Booth watched a demonstration of the device, which blew dust off the chairs, and thought that "...if the system could be reversed, and a filter inserted between the suction apparatus and the outside air, whereby the dust would be retained in a receptacle, the real solution of the hygienic removal of dust would be obtained."He tested the idea by laying a handkerchief on the seat of a restaurant chair, putting his mouth to the handkerchief, and then trying to suck up as much dust as he could onto the handkerchief. Upon seeing the dust and dirt collected on the underside of the handkerchief, he realized the idea could work.

Booth created a large device, driven by an internal combustion engine. Nicknamed the "Puffing Billy", Booth's first petrol-powered, horse-drawn vacuum cleaner relied upon air drawn by a piston pump through a cloth filter. It did not contain any brushes; all the cleaning was done by suction through long tubes with nozzles on the ends. Although the machine was too bulky to be brought into the building, its principles of operation were essentially the same as the vacuum cleaners of today. He followed this up with an electric-powered model, but both designs were extremely bulky, and had to be transported by horse and carriage. The term "vacuum cleaner" was first used by the company set up to market Booth's invention, in its first issued prospectus of 1901.

Booth initially did not attempt to sell his machine, but rather sold cleaning services. The vans of the British Vacuum Cleaner Company (BVCC) were bright red; uniformed operators would haul hose off the van and route it through the windows of a building to reach all the rooms inside. Booth was harassed by complaints about the noise of his vacuum machines and was even fined for frightening horses.[citation needed] Gaining the royal seal of approval, Booth's motorized vacuum cleaner was used to clean the carpets of Westminster Abbey prior to Edward VII's coronation in 1901. The device was used by the Royal Navy to improve the level of sanitation in the naval barracks. It was also used in businesses such as theatres and shops, although the device was too large to be feasibly used as a domestic appliance.

Booth received his first patents on 18 February and 30 August 1901.Booth started the BVCC and refined his invention over the next several decades. Though his "Goblin" model lost out to competition from Hoover in the household vacuum market, his company successfully turned its focus to the industrial market, building ever-larger models for factories and warehouses. Booth's company, now BVC, lives on today as a unit of pneumatic tube system maker Quirepace Ltd.

The American industry was established by the New Jersey inventor David T. Kenney between 1903 and 1913. Membership in the Vacuum Cleaner Manufacturers' Association, formed in 1919, was limited to licensees under his patents.

Oven

An oven is a thermally insulated chamber used for the heating, baking or drying of a substance, and most commonly used for cooking. Kilns and furnaces are special-purpose ovens, used in pottery and metalworking, respectively.

History

A toaster oven

The earliest ovens were found in Central Europe, and dated to 29,000 BC. They were roasting and boiling pits inside yurts used to cook mammoth.In Ukraine from 20,000 BC they used pits with hot coals covered in ashes. The food was wrapped in leaves and set on top, then covered with earth.In camps found in Mezhirich, each mammoth bone house had a hearth used for heating and cooking.Ovens were used by cultures who lived in the Indus Valley and in pre-dynastic Egypt. By 3200 BC, each mud-brick house had an oven in settlements across the Indus Valley. Ovens were used to cook food and to make bricks.Pre-dynastic civilizations in Egypt used kilns around 5000–4000 BC to make pottery.

Culinary historians credit the Greeks for developing bread baking significantly.Front-loaded bread ovens were developed in ancient Greece. The Greeks created a wide variety of doughs, loaf shapes, and styles of serving bread with other foods. Baking developed as a trade and profession as bread increasingly was prepared outside of the family home by specially trained workers to be sold to the public.

During the Middle Ages, instead of earth and ceramic ovens, Europeans used fireplaces in conjunction with large cauldrons. These were similar to the Dutch oven. Following the Middle-Ages, ovens underwent many changes over time from wood, iron, coal, gas, and even electric. Each design had its own motivation and purpose. The wood burning stoves saw improvement through the addition of fire chambers that allowed better containment and release of smoke. Another recognizable oven would be the cast-iron stove. These were first used around the early 1700s when they themselves underwent several variations including the Stewart Oberlin iron stove that was smaller and had its own chimney.

In the early part of the 19th century, coal ovens were developed. Its shape was cylindrical and was made of heavy cast-iron. The gas oven saw its first use as early as the beginning of the 19th century as well. Gas stoves became very common household ovens once gas lines were available to most houses and neighborhoods. James Sharp patented one of the first gas stoves in 1826. Other various improvements to the gas stove included the AGA cooker invented in 1922 by Gustaf Dalén. The first electric ovens were invented in the very late 19th century, however, like many electrical inventions destined for commercial use, mass ownership of electrical ovens could not be a reality until better and more efficient use of electricity was available.

More recently, ovens have become slightly more high-tech in terms of cooking strategy. The microwave as a cooking tool was discovered by Percy Spencer in 1946, and with the help from engineers, the microwave oven was patented. The microwave oven uses microwave radiation to excite the molecules in food causing friction, thus producing heat.

Types of ovens

A wood-fired pizza oven, a type of masonry oven

Stove bench in a German farm's living room

Earth oven: An earth oven is a pit dug into the ground and then heated, usually by rocks or smoldering debris. Historically these have been used by many cultures for cooking. Cooking times are usually long, and the process is usually cooking by slow roasting the food. Earth ovens are among the most common things archaeologists look for at an anthropological dig, as they are one of the key indicators of human civilization and static society.

Ceramic oven: The ceramic oven is an oven constructed of clay or any other ceramic material and takes different forms depending on the culture. The Indians refer to it as a tandoor, and use it for cooking. They can be dated back as far as 3,000 BC, and they have been argued to have their origins in the Indus Valley. Brick ovens are also another ceramic type oven. A culture most notable for the use of brick ovens is Italy and its intimate history with pizza. However, its history also dates further back to Roman times, wherein the brick oven was used not only for commercial use but household use as well.

Gas oven: One of the first recorded uses of a gas stove and oven referenced a dinner party in 1802 hosted by Zachaus Winzler, where all the food was prepared either on a gas stove or in its oven compartment. In 1834, British inventor James Sharp began to commercially produce gas ovens after installing one in his own house. In 1851, the Bower's Registered Gas Stove was displayed at the Great Exhibition. This stove would set the standard and basis for the modern gas oven. Notable improvements to the gas stove since include the addition of the thermostat which assisted in temperature regulation; also an enamel coating was added to the production of gas stoves and ovens in order to help with easier cleaning.

Masonry oven: Masonry ovens consist of a baking chamber made of fireproof brick, concrete, stone, or clay. Though traditionally wood-fired, coal-fired ovens were common in the 19th century. Modern masonry ovens are often fired with natural gas or even electricity, and are closely associated with artisanal bread and pizza. In the past, however, they were also used for any cooking task that required baking.

Microwave oven: An oven that uses micro radiation waves as a source of heat in order to cook food as opposed to a fire source. Conceptualized in 1946, Dr. Perry Spencer allegedly discovered the heating properties of microwaves while studying the magnetron. By 1947, the first commercial microwave was in use in Boston, Mass.

Wall oven: Wall ovens make it easier to work with large roasting pans and Dutch ovens. A width is typically 24, 27, or 30 inches. Mounted at waist or eye level, a wall oven eliminates bending. However, it can be nested under a countertop to save space. A separate wall oven is expensive compared with a range. 

Mixer (cooking)

A mixer is a kitchen utensil which uses a gear-driven mechanism to rotate a set of beaters in a bowl containing the food to be prepared. It automates the repetitive tasks of stirring, whisking or beating. When the beaters are replaced by a dough hook, a mixer may also be used to knead.

A mixer may be a handheld mechanism known as an eggbeater, a handheld motorized beater, or a stand mixer. Stand mixers vary in size from small countertop models for home use to large capacity commercial machines. Stand mixers create the mixing action by rotating the mixing device vertically: planetary mixers, or by rotating the mixing container: spiral mixers.

Mixers for the kitchen first came into use midway through the nineteenth century; the earliest were mechanical devices. The demand from commercial bakers for large-scale uniform mixing resulted in the development of the electric stand mixer. Smaller counter-top stand mixers for home kitchen use soon followed.

History

A vintage hand-cranked egg beater

The mixer with rotating parts was patented in 1856 by Baltimore, Maryland tinner Ralph Collier. U.S. Patent 16,267 This was followed by E.P. Griffith's whisk patented in England in 1857. Another hand-turned rotary egg beater was patented by J.F. and E.P. Monroe in 1859 in the US. U.S. Patent 23,694 Their egg beater patent was one of the earliest bought up by the Dover Stamping Company, whose Dover egg beaters became a classic American brand. The Monroe design was also manufactured in England. In 1870, Turner Williams of Providence, R.I., invented another Dover egg beater model. U.S. Patent 103,811

Whisking egg whites with a handheld electric mixer

The first mixer with electric motor is thought to be the one invented by American Rufus Eastman in 1885. U.S. Patent 330,829 The Hobart Manufacturing Company was an early manufacturer of large commercial mixers, and they say a new model introduced in 1914 played a key role in the mixer part of their business.The Hobart KitchenAid and Sunbeam Mixmaster (first produced 1910) were two very early US brands of electric mixer. Domestic electric mixers were rarely used before the 1920s, when they were adopted more widely for home use.

In 1908 Herbert Johnson, an engineer for the Hobart Manufacturing Company, invented an electric standing mixer. His inspiration came from observing a baker mixing bread dough with a metal spoon; soon he was toying with a mechanical counterpart. By 1915, his 80-quart mixer was standard equipment for most large bakeries. In 1919, Hobart introduced the Kitchen Aid Food Preparer (stand mixer) for the home.

Older models of mixers originally listed each speed by name of operation (ex: Beat-Whip would be high speed if it is a 3-speed mixer); they are now listed by number.

Variants

A large volume stand mixer used in a commercial bakery to mix bread dough with a double sided dough hook

A stand mixer in action on a home tabletop, with a wire whisk attachment

Eggbeater

An eggbeater is a handheld device with a crank on the side geared to one or more beaters. The user grips the handle with one hand and operates the crank with the other, creating the rotary action.

Stand Mixer

Stand mixers mount the motor driving the rotary action in a frame or stand which bears the weight of the device. Stand mixers are larger and have more powerful motors than their hand-held counterparts. They generally have a special bowl that is locked in place while the mixer is operating. A typical home stand mixer will include a wire whip for whipping creams and egg whites; a flat beater for mixing batters; and a dough hook for kneading.

Stand mixers are generally available in either counter top (also called bench) or floor models. Heavy duty commercial models can have bowl capacities well in excess of 100 quarts (95 L) and weigh thousands of pounds, but more typical home and light commercial models are equipped with bowls of around 4 quarts (4 L). Whether a mixer is a counter top or floor model depends on its size. Mixers that are 20 quarts in size or smaller tend to be counter top mixers, while larger mixers tend to be floor models due to their size and weight.

Spiral mixers are specialist tools for mixing dough. A spiral-shaped agitator remains stationary while the bowl rotates. This method enables spiral mixers to mix the same size dough batch much quicker and with less under-mixed dough than a similarly powered planetary mixer. Spiral mixers can mix dough with less agitator friction than planetary mixers. This allows the dough to be mixed without increasing its temperature, ensuring the dough can rise properly.

Planetary mixers consist of a bowl and an agitator. The bowl remains static, whilst the agitator is rapidly moved around the bowl to mix its contents. With the ability to mix a wide variety of ingredients, planetary mixers are more versatile than their spiral counterparts. Planetary mixers can be used to whip and blend, whereas spiral mixers cannot.

Hand Mixer

A hand mixer is a hand-held mixing device. A handle is mounted over an enclosure containing the motor. The motor drives the beaters which are immersed in the food to perform the mixing action. The motor must be lightweight as it is supported by the user during use. The user may use any suitable kitchen container to hold the ingredients while mixing.

The electric hand-mixer was invented in 1964 by Dynamic (company), sited in western France. Its products are essentially the same design it has always produced.

Loudspeaker

A loudspeaker (or loud-speaker or speaker) is an electroacoustic transducer; a device which converts an electrical audio signal into a corresponding sound.The first crude loudspeakers were invented during the development of telephone systems in the late 1800s, but electronic amplification by vacuum tube beginning around 1912 made loudspeakers truly practical. By the 1920s they were used in radios, phonographs, public address systems and theatre sound systems for talking motion pictures.

The most widely-used type of speaker today is the dynamic speaker, invented in 1925 by Edward W. Kellogg and Chester W. Rice. The dynamic speaker operates on the same basic principle as a dynamic microphone, but in reverse, to produce sound from an electrical signal. When an alternating current electrical audio signal input is applied through the voice coil, a coil of wire suspended in a circular gap between the poles of a permanent magnet, the coil is forced to move rapidly back and forth due to Faraday's law of induction, which causes a diaphragm (usually conically shaped) attached to the coil to move back and forth, pushing on the air to create sound waves. Besides this most common method, there are several alternative technologies that can be used to convert an electrical signal into sound.

Speakers are typically housed in an enclosure which is often a rectangular or square box made of wood or sometimes plastic. Where high fidelity reproduction of sound is required, multiple loudspeakers may be mounted in the same enclosure, each reproducing a part of the audible frequency range (picture at right). In this case the individual speakers are referred to as "drivers" and the entire unit is called a loudspeaker. Miniature loudspeakers are found in devices such as radio and TV receivers, and many forms of music players. Larger loudspeaker systems are used for music, sound reinforcement in theatres and concerts, and in public address systems.

Terminology

The term "loudspeaker" may refer to individual transducers (known as "drivers") or to complete speaker systems consisting of an enclosure including one or more drivers.

To adequately reproduce a wide range of frequencies with even coverage, most loudspeaker systems employ more than one driver, particularly for higher sound pressure level or maximum accuracy. Individual drivers are used to reproduce different frequency ranges. The drivers are named subwoofers (for very low frequencies); woofers (low frequencies); mid-range speakers (middle frequencies); tweeters (high frequencies); and sometimes supertweeters, optimized for the highest audible frequencies. The terms for different speaker drivers differ, depending on the application. In two-way systems there is no mid-range driver, so the task of reproducing the mid-range sounds falls upon the woofer and tweeter. Home stereos use the designation "tweeter" for the high frequency driver, while professional concert systems may designate them as "HF" or "highs". When multiple drivers are used in a system, a "filter network", called a crossover, separates the incoming signal into different frequency ranges and routes them to the appropriate driver. A loudspeaker system with n separate frequency bands is described as "n-way speakers": a two-way system will have a woofer and a tweeter; a three-way system employs a woofer, a mid-range, and a tweeter. Loudspeakers were described as "dynamic" to distinguish them from the earlier moving iron speaker, or speakers using piezoelectric or electrostatic systems as opposed to a voice coil that moves through a steady magnetic field.

Power Supply

A power supply is an electronic device that supplies electric energy to an electrical load. The primary function of a power supply is to convert one form of electrical energy to another and, as a result, power supplies are sometimes referred to as electric power converters. Some power supplies are discrete, stand-alone devices, whereas others are built into larger devices along with their loads. Examples of the latter include power supplies found in desktop computers and consumer electronics devices.

Every power supply must obtain the energy it supplies to its load, as well as any energy it consumes while performing that task, from an energy source. Depending on its design, a power supply may obtain energy from various types of energy sources, including electrical energy transmission systems, energy storage devices such as a batteries and fuel cells, electromechanical systems such as generators and alternators, solar power converters, or another power supply.

All power supplies have a power input, which receives energy from the energy source, and a power output that delivers energy to the load. In most power supplies the power input and output consist of electrical connectors or hardwired circuit connections, though some power supplies employ wireless energy transfer in lieu of galvanic connections for the power input or output. Some power supplies have other types of inputs and outputs as well, for functions such as external monitoring and control.

General classification

Functional

Power supplies are categorized in various ways, including by functional features. For example, a regulated power supply is one that maintains constant output voltage or current despite variations in load current or input voltage. Conversely, the output of an unregulated power supply can change significantly when its input voltage or load current changes. Adjustable power supplies allow the output voltage or current to be programmed by mechanical controls (e.g., knobs on the power supply front panel), or by means of a control input, or both. An adjustable regulated power supply is one that is both adjustable and regulated. An isolated power supply has a power output that is electrically independent of its power input; this is in contrast to other power supplies that share a common connection between power input and output.

Mechanical

Power supplies are packaged in different ways and classified accordingly. A bench power supply is a stand-alone desktop unit used in applications such as circuit test and development. Open frame power supplies have only a partial mechanical enclosure, sometimes consisting of only a mounting base; these are typically built into machinery or other equipment. Rack mount power supplies are designed to be secured into standard electronic equipment racks.

Power conversion method

Power supplies can be broadly divided into linear and switching types. Linear power converters process the input power directly, with all active power conversion components operating in their linear operating regions. In switching power converters, the input power is converted to AC or to DC pulses before processing, by components that operate predominantly in non-linear modes (e.g., transistors that spend most of their time in cutoff or saturation). Power is "lost" (converted to heat) when components operate in their linear regions and, consequently, switching converters are usually more efficient than linear converters because their components spend less time in linear operating regions.

Router (computing)

A typical home or small office router showing the ADSL telephone line and Ethernet network cable connections

A Cisco ASM/2-32EM router deployed at CERN in 1987

A router[a] is a networking device that forwards data packets between computer networks. A router is connected to two or more data lines from different networks (as opposed to a network switch, which connects data lines from one single network). When a data packet comes in on one of the lines, the router reads the address information in the packet to determine its ultimate destination. Then, using information in its routing table or routing policy, it directs the packet to the next network on its journey. This creates an overlay internetwork. Routers perform the "traffic directing" functions on the Internet. A data packet is typically forwarded from one router to another through the networks that constitute the internetwork until it reaches its destination node.

The most familiar type of routers are home and small office routers that simply pass data, such as web pages, email, IM, and videos between the home computers and the Internet. An example of a router would be the owner's cable or DSL router, which connects to the Internet through an ISP. More sophisticated routers, such as enterprise routers, connect large business or ISP networks up to the powerful core routers that forward data at high speed along the optical fiber lines of the Internet backbone. Though routers are typically dedicated hardware devices, use of software-based routers has grown increasingly common.

Applications

When multiple routers are used in interconnected networks, the routers exchange information about destination addresses using a dynamic routing protocol. Each router builds up a table listing the preferred routes between any two systems on the interconnected networks. A router has interfaces for different physical types of network connections, such as copper cables, fibre optic, or wireless transmission. It also contains firmware for different networking communications protocol standards. Each network interface uses this specialized computer software to enable data packets to be forwarded from one protocol transmission system to another.

Routers may also be used to connect two or more logical groups of computer devices known as subnets, each with a different sub-network address. The subnet addresses recorded in the router do not necessarily map directly to the physical interface connections.

A router has two stages of operation called planes:

Control plane: A router maintains a routing table that lists which route should be used to forward a data packet, and through which physical interface connection. It does this using internal pre-configured directives, called static routes, or by learning routes using a dynamic routing protocol. Static and dynamic routes are stored in the Routing Information Base (RIB). The control-plane logic then strips the RIB from non essential directives and builds a Forwarding Information Base (FIB) to be used by the forwarding-plane.

Forwarding plane: The router forwards data packets between incoming and outgoing interface connections. It routes them to the correct network type using information that the packet header contains. It uses data recorded in the routing table control plane.

Routers may provide connectivity within enterprises, between enterprises and the Internet, or between internet service providers' (ISPs) networks. The largest routers (such as the Cisco CRS-1 or Juniper T1600) interconnect the various ISPs, or may be used in large enterprise networks. Smaller routers usually provide connectivity for typical home and office networks. Other networking solutions may be provided by a backbone Wireless Distribution System (WDS), which avoids the costs of introducing networking cables into buildings.

All sizes of routers may be found inside enterprises. The most powerful routers are usually found in ISPs, academic and research facilities. Large businesses may also need more powerful routers to cope with ever increasing demands of intranet data traffic. A three-layer model is in common use, not all of which need be present in smaller networks.

About electronics, what is electronics?

Electronics is the science of how to control the electric energy, energy in which the electrons have a fundamental role. Electronics deals with electrical circuits that involve active electrical components such as vacuum tubes, transistors, diodes and integrated circuits, and associated passive electrical components and interconnection technologies. Commonly, electronic devices contain circuitry consisting primarily or exclusively of active semiconductors supplemented with passive elements; such a circuit is described as an electronic circuit.

The nonlinear behaviour of active components and their ability to control electron flows makes amplification of weak signals possible, and electronics is widely used in information processing, telecommunication, and signal processing. The ability of electronic devices to act as switches makes digital information processing possible. Interconnection technologies such as circuit boards, electronics packaging technology, and other varied forms of communication infrastructure complete circuit functionality and transform the mixed components into a regular working system.

Electronics is distinct from electrical and electro-mechanical science and technology, which deal with the generation, distribution, switching, storage, and conversion of electrical energy to and from other energy forms using wires, motors, generators, batteries, switches, relays, transformers, resistors, and other passive components. This distinction started around 1906 with the invention by Lee De Forest of the triode, which made electrical amplification of weak radio signals and audio signals possible with a non-mechanical device. Until 1950 this field was called "radio technology" because its principal application was the design and theory of radio transmitters, receivers, and vacuum tubes.

Today, most electronic devices use semiconductor components to perform electron control. The study of semiconductor devices and related technology is considered a branch of solid-state physics, whereas the design and construction of electronic circuits to solve practical problems come under electronics engineering. This article focuses on engineering aspects of electronics.