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In electrical engineering, a switch is an electrical component that can disconnect or connect the conducting path in an electrical circuit, interrupting the electric current or diverting it from one conductor to another. The most common type of switch is an electromechanical device consisting of one or more sets of movable electrical contacts connected to external circuits. When a pair of contacts is touching current can pass between them, while when the contacts are separated no current can flow.
Switches are made in many different configurations; they may have multiple sets of contacts controlled by the same knob or actuator, and the contacts may operate simultaneously, sequentially, or alternately. A switch may be operated manually, for example, a light switch or a keyboard button, or may function as a sensing element to sense the position of a machine part, liquid level, pressure, or temperature, such as a thermostat. Many specialized forms exist, such as the toggle switch, rotary switch, mercury switch, push-button switch, reversing switch, relay, and circuit breaker. A common use is control of lighting, where multiple switches may be wired into one circuit to allow convenient control of light fixtures. Switches in high-powered circuits must have special construction to prevent destructive arcing when they are opened.

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  1. K

    Boiler won't switch on

    Hi. I have a Worcester combi boiler that won't switch on. I tried to install a new thermostat but couldn't get it to work. Ever since then I seem to have no power to the boiler. I think I may have shorted something and blown it up. The main fuse in the circuit breaker is ok. Are there any other...
  2. B

    How to switch off a Saniflo

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  3. U

    Central heating = not working until I switch Hot Water on.

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    • Unregistered
    • Thread
    • central central heating heating hot hot water not working switch until water working
    • Replies: 4
    • Forum: Plumbing Jobs | The Job-board
  4. E

    Water in Air Pressure Switch

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  5. T

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  6. D

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  7. L

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  8. S

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  9. I

    Boiler not lighting up on one channel

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  10. A

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  11. G

    Upinor underfloor heating

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  12. S

    Drayton UP2 Dual Channel Programmer - CH not working

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  13. U

    Heat Slave 15/19 Oil Boiler Hot Water Random

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  14. Eyespy999

    Surestop - any advice please

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  15. hammers4spanner

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  16. B

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  17. A

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  18. O

    Warmflow 70/90 help needed.

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  19. phil hair

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  20. M

    electric shower disconnecting?

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