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  2. Automobile auxiliary power outlet - Wikipedia

    en.wikipedia.org/wiki/Automobile_auxiliary_power...

    12-volt cigarette lighter receptacle and plug, size A. Receptacle inside diameter: 20.93–21.01 mm (median 20.97 mm) Plug body diameter: 20.73–20.88 mm (median 20.805 mm) Most often used in American automobiles; 12-volt cigarette lighter receptacle and plug, size B. Receptacle inside diameter: 21.41–21.51 mm (median 21.455 mm)

  3. Multiway switching - Wikipedia

    en.wikipedia.org/wiki/Multiway_switching

    The switches may be arranged so that they are in the same orientation for off, and contrasting orientations for on. [1] A "4-way" (intermediate) switch is a purpose built double pole, double throw (DPDT) switch, internally wired in manufacture to reverse the connections between the input and output and having only four external terminals. This ...

  4. Volt-ampere - Wikipedia

    en.wikipedia.org/wiki/Volt-ampere

    1 kg⋅m 2 ⋅s −3 The volt-ampere ( SI symbol : VA , [ 1 ] sometimes V⋅A or V A ) is the unit of measurement for apparent power in an electrical circuit . It is the product of the root mean square voltage (in volts ) and the root mean square current (in amperes ). [ 2 ]

  5. Relay - Wikipedia

    en.wikipedia.org/wiki/Relay

    A relay is an electrically operated switch. It consists of a set of input terminals for a single or multiple control signals, and a set of operating contact terminals. The switch may have any number of contacts in multiple contact forms, such as make contacts, break contacts, or combinations thereof.

  6. Switched-mode power supply - Wikipedia

    en.wikipedia.org/wiki/Switched-mode_power_supply

    Stand-alone switched-mode power supply An adjustable switched-mode power supply for laboratory use. A switched-mode power supply (SMPS), also called switching-mode power supply, switch-mode power supply, switched power supply, or simply switcher, is an electronic power supply that incorporates a switching regulator to convert electrical power efficiently.

  7. Switch - Wikipedia

    en.wikipedia.org/wiki/Switch

    [1] [2] 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.