A 12v relay is an electrically operated switch. Many 12v relays use an electromagnet to operate a switching mechanism mechanically,
but other operating principles are also used. Relays are used where it is necessary to control a circuit by a low-power signal (with
complete electrical isolation between control and controlled circuits), or where several circuits must be controlled by one signal.
The first relays were used in long distance telegraph circuits, repeating the signal coming in from one circuit and re-transmitting
it to another. Relays were used extensively in telephone exchanges and early computers to perform logical operations.
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