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Royal Maundy is a religious service in the Church of England held on Maundy Thursday. At the service, the British monarch or a royal official distributes small silver coins known as "Maundy money". The name "Maundy" and the ceremony derive from the instruction of Jesus at the Last Supper that his followers should love one another.
Elon Reeve Musk (/ ˈ iː l ɒ n /; EE-lon; born June 28, 1971) is a businessman and investor.He is the founder, chairman, CEO, and CTO of SpaceX; angel investor, CEO, product architect, and former chairman of Tesla, Inc.; owner, executive chairman, and CTO of X Corp.; founder of the Boring Company and xAI; co-founder of Neuralink and OpenAI; and president of the Musk Foundation.
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QWERTY ( / ˈkwɜːrti / KWUR-tee) is a keyboard layout for Latin-script alphabets. The name comes from the order of the first six keys on the top letter row of the keyboard ( Q W E R T Y ). The QWERTY design is based on a layout included in the Sholes and Glidden typewriter sold via E. Remington and Sons from 1874.
- History
- Importance
- Simplified Operation
- Comparison with Vacuum Tubes
- Types
- Device Identification
- Construction
- External Links
The thermionic triode, a vacuum tube invented in 1907, enabled amplified radio technology and long-distance telephony. The triode, however, was a fragile device that consumed a substantial amount of power. In 1909, physicist William Eccles discovered the crystal diode oscillator. Physicist Julius Edgar Lilienfeld filed a patent for a field-effect t...
Because transistors are the key active components in practically all modern electronics, many people consider them one of the 20th century's greatest inventions. The invention of the first transistor at Bell Labs was named an IEEE Milestone in 2009. Other Milestones include the inventions of the junction transistorin 1948 and the MOSFET in 1959. Th...
A transistor can use a small signal applied between one pair of its terminals to control a much larger signal at another pair of terminals, a property called gain. It can produce a stronger output signal, a voltage or current, proportional to a weaker input signal, acting as an amplifier. It can also be used as an electrically controlled switch, wh...
Before transistors were developed, vacuum (electron) tubes(or in the UK "thermionic valves" or just "valves") were the main active components in electronic equipment.
Classification
Transistors are categorized by 1. Structure: MOSFET (IGFET), BJT, JFET, insulated-gate bipolar transistor (IGBT), other types[which?]. 2. Semiconductor material (dopants): 2.1. The metalloids; germanium (first used in 1947) and silicon (first used in 1954)—in amorphous, polycrystalline and monocrystallineform. 2.2. The compounds gallium arsenide (1966) and silicon carbide(1997). 2.3. The alloy silicon-germanium(1989) 2.4. The allotrope of carbon graphene (research ongoing since 2004), etc. (s...
Mnemonics
Convenient mnemonic to remember the type of transistor (represented by an electrical symbol) involves the direction of the arrow. For the BJT, on an n-p-n transistor symbol, the arrow will "Not Point iN". On a p-n-p transistor symbol, the arrow "Points iN Proudly". However, this does not apply to MOSFET-based transistor symbols as the arrow is typically reversed (i.e. the arrow for the n-p-n points inside).
Field-effect transistor
The field-effect transistor, sometimes called a unipolar transistor, uses either electrons (in n-channel FET) or holes (in p-channel FET) for conduction. The four terminals of the FET are named source, gate, drain, and body (substrate). On most FETs, the body is connected to the source inside the package, and this will be assumed for the following description. In a FET, the drain-to-source current flows via a conducting channel that connects the source region to the drain region. The conducti...
Three major identification standards are used for designating transistor devices. In each, the alphanumeric prefix provides clues to the type of the device.
Semiconductor material
The first BJTs were made from germanium (Ge). Silicon (Si) types currently predominate but certain advanced microwave and high-performance versions now employ the compound semiconductor material gallium arsenide (GaAs) and the semiconductor alloy silicon-germanium (SiGe). Single-element semiconductor material (Ge and Si) is described as elemental. Rough parameters for the most common semiconductor materials used to make transistors are given in the adjacent table. These parameters will vary w...
Packaging
Discrete transistors can be individually packaged transistors or unpackaged transistor chips. Transistors come in many different semiconductor packages (see image). The two main categories are through-hole (or leaded), and surface-mount, also known as surface-mount device (SMD). The ball grid array (BGA) is the latest surface-mount package. It has solder "balls" on the underside in place of leads. Because they are smaller and have shorter interconnections, SMDs have better high-frequency char...
This Month in Physics History: November 17 to December 23, 1947: Invention of the First Transistor. From the American Physical SocietyThomas Cruise Mapother IV (born July 3, 1962) is an American actor and producer. Regarded as a Hollywood icon,[1][2][3] he has received various accolades, including an Honorary Palme d'Or and three Golden Globe Awards, in addition to nominations for four Academy Awards. His films have grossed over $4 billion in North America and over $11.5 ...
Rosamund Mary Ellen Pike[2] (born 1979)[a] is a British actress. Pike studied at Wadham College, Oxford and began her acting career by appearing in stage productions including Romeo and Juliet at the National Youth Theatre. She had her breakthrough for her film debut as Bond girl Miranda Frost in Die Another Day (2002), and had supporting ...
Dwayne Douglas Johnson (born May 2, 1972), also known by his ring name The Rock, is an American actor, businessman, and professional wrestler. He is currently signed to WWE performing on the SmackDown brand as a member of The Bloodline. Widely regarded as one of the greatest professional wrestlers of all time,[6][7] he was integral to the ...