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switch,

electrical device having two states: on, or closed; and off, or open. Ideally a switch offers a zero impedanceimpedance,
in electricity, measure in ohms of the degree to which an electric circuit resists the flow of electric current when a voltage is impressed across its terminals.
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 to a current when it is closed, and it offers infinite impedance when open. Mechanical switches, which operate by moving contacts together and apart, are often classified by the number of connections they can make or break at once and the number of closed positions in which they can be placed. A single-pole double-throw switch can be placed in either of two closed positions, making one connection in each position. A double-pole single-throw switch can open or close two connections at once. For many operations, as in computers and digital telecommunications, the operation of mechanical switches is too slow and transistorstransistor,
three-terminal, solid-state electronic device used for amplification and switching. It is the solid-state analog to the triode electron tube; the transistor has replaced the electron tube for virtually all common applications.
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 are used instead. The PIN diodediode
, two-terminal electronic device that permits current flow predominantly in only one direction. Most diodes are semiconductor devices; diode electron tubes are now used only for a few specialized applications.
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, which contains an intermediate intrinsic layer between the n-type and p-type layers, is also used as a simple switch. This device, which normally acts as a conductor, acts as a strong dielectric when the intrinsic layer is reverse biased. See relayrelay,
electromechanical switch operated by a flow of electricity in one circuit and controlling the flow of electricity in another circuit. A relay consists basically of an electromagnet with a soft iron bar, called an armature, held close to it.
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.

Bibliography

See J. C. McDonald, Fundamentals of Digital Switching (1990).

Switch

In electrical work, a device for closing, opening, or changing the connections of the circuit in which it is placed.

Switch

 

a device that selects the required output circuit (or circuits) and connects to it an input circuit (or circuits) by means of connection, disconnection, or commutation. The selection may be manual or automatic, following a program stated in terms of a time or state function of other electric circuits. Switches are a component of more complex data-transmission equipment used in telemechanics and communications engineering, and they are used to solve programming and control problems in computer technology and to connect circuits in electric machines.

A distinction is made among electromechanical, electronic, and electron-beam switches. The simplest electromechanical switches are knife switches, commutators of electric machines, and sets of electromagnetic relays or electromechanical selectors. More complex switches are electronic devices assembled according to definite functional schemes; they may include ionic devices, electron tubes, semiconductor devices, and electron-tube commutators, as well as gas-discharge tubes and circulators (for ultrahigh frequencies).

switch

[swich]
(computer science)
A hardware or programmed device for indicating that one of several alternative states or conditions have been chosen, or to interchange or exchange two data items.
A symbol used to indicate a branch point, or a set of instructions to condition a branch.
(civil engineering)
A device for enabling a railway car to pass from one track to another.
The junction of two tracks.
(electricity)
A manual or mechanically actuated device for making, breaking, or changing the connections in an electric circuit. Also known as electric switch. Symbolized SW.

switch

A device used to open or close an electric circuit or to change the connection of a circuit.

switch

1. a mechanical, electrical, electronic, or optical device for opening or closing a circuit or for diverting energy from one part of a circuit to another
2. the tassel-like tip of the tail of cattle and certain other animals
3. any of various card games in which the suit is changed during play
4. US and Canadian a railway siding
5. US and Canadian a railway point

switch

(programming)

switch

(software)

switch

(networking)

switch

(1) In programming, a bit or byte used to keep track of some event. The term is sometimes synonymous with the branch command.

(2) In programming, a statement that saves the programmer from having to write multiple compare statements. See event loop.

(3) A modifier of a command. For example, in the Windows/DOS command dir /p the /p is a switch that modifies the Dir command to pause after each screenful. See Dir.

(4) (SWITCH) A line of LED light bulbs from SWITCH Lighting (www.switchlightingco.com). See LED lighting.

(5) A mechanism that allows each key to be depressed on a keyboard. See mechanical keyboard.

(6) A mechanical or electronic device that directs the flow of electrical or optical signals from one side to the other. Switches with more than two ports, such as a LAN switch or PBX, are able to route traffic. See LAN switch, softswitch, PBX, data switch and transistor.

With regard to a simple on/off switch, remember... Open is "off." Closed is "on."


Mechanical and Semiconductor Switches
The semiconductor switch (transistor) performs the same function as a light switch on the wall. Instead of being manually closed, the switch is electronically closed by pulsing the semiconductor material, which makes it conduct.







A Manual Switch
This early switch panel from New York Electric Switchboard Company was used to manually open and close electric lines.
References in periodicals archive ?
The ATEM TVS Pro HD has so many dedicated buttons that in many cases you can punch in the controls that you want, and when you pair this with the LCD screen on the hardware switcher that allows you to dive deep into the control menus, you don't have to run the software control panel at the same time if you don't want to.
Because it is a full-fledged member of the K-Frame family, the V-series can be used with any GV K-Frame switcher panels, such as Karrera and Kayenne, and requires no training for anyone accustomed to working on Grass Valley K-Frame switchers.
HD-SDI is the gold standard for video switcher input connectors because this single cable can run longer than the equivalent consumer HDMI standard and requires one-third as many cables as the analog component video standard.
In contrast, the 2M/E production switcher model is a larger three-rack unit, and includes two separate M/E rows, a total of 16 video inputs, six aux outputs, two multiviews for monitoring, redundant power input, and SuperSource multi-layer compositing.
ATEM audio mixer software adds a built in audio mixer into the ATEM 2 M/E Production Switcher.
We're delighted that LeTV Sports is harnessing the agility and flexibility of our new Kula switcher as we're growing market share in China.
Featuring Auto-EDID management as well as Audio Return Channel (ARC) capabilities, this new switcher is fully 3D compatible, with up to UHD/4K resolution at 50/60Hz.
The MCX-500 is a 4-channel video switcher that offers users the option to select from 9 inputs, including 4x 3G-SDI, 2x HDMI and 2x CVBS.
We also evaluated many other brands before finally selecting the Vision switcher and other Ross products.
ATEM 1 M/E Production Switcher is used at each match in conjunction with up to six cameras capturing tight shots of players, wider area views following the "pack," and announcer and crowd shots.
The company has a long history in the industry, not only developing the world's first digital matrix switcher, but also the first HDCP-compliant matrix switcher and the first modular cross-platform digital matrix switcher.
The switcher supports SD, HD, 3G and 4K applications, up to 48 inputs/18 outputs or 40 inputs/22 outputs, and features exclusive functions that allow operators to enhance their power and creativity in video switching.