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An intermediate switch can, however, be implemented by adding appropriate external wiring to an ordinary (six terminal) DPDT switch, or by using a separate DPDT relay. By connecting one or more 4-way (intermediate) switches in-line, with 3-way switches at either end, the load can be controlled from three or more locations.
A 3-way lamp, also known as a tri-light, is a lamp that uses a 3-way light bulb to produce three levels of light in a low-medium-high configuration. A 3-way lamp requires a 3-way bulb and socket, and a 3-way switch. In 3-way incandescent light bulbs, each of the filaments operates at full voltage. Lamp bulbs with dual carbon filaments were ...
The first light switch employing "quick-break technology" was invented by John Henry Holmes in 1884 in the Shieldfield district of Newcastle upon Tyne. [1] The "quick-break" switch overcame the problem of a switch's contacts developing electric arcing whenever the circuit was opened or closed.
There are various types of devices used to manage the amount of light used: [6] 3-way 2-circuit switch; Dimmer (this allows the user to make a light brighter or dimmer, typically using a rotary dial) Light switch (often part of the light socket or power cord on portable fixtures) Lighting control system; Motion detector; Timer; Touch; X10 systems
[3] [4] While a pair of contacts is closed, only a small part of the contacts are in intimate contact due to asperities and low-conductivity films. Because of the constriction of the current to a very small area, the current density frequently becomes so high that it melts a microscopic portion of the contact. [ 5 ]
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Developing technology behind the modern light switch John Henry Holmes (1857 – 1935) was an English electrical engineer , inventor, Quaker and pioneer of electric lighting who invented the quick break light switch, the technology behind which remains the basis for modern wall mounted light switches .
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