Final answer:
A relay is a circuit device that uses a low-current signal to control a much higher current load by automatically switching the output device on or off.
Explanation:
Relay is a circuit device that uses a low-current signal to control a much higher current load. It works by using an input sensor in combination with a transistor to switch the output device on or off automatically.
Relays are commonly used in various applications, including in household appliances and in control circuits where one circuit controls another circuit, like in the case of a transistor controlling a larger current load based on the base-emitter current.
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