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What is the role of a relay in a circuit?

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The role of a relay in a circuit is to act as an electrically operated switch. It is used to control a high-power circuit with a low-power signal, allowing for isolation between the control signal and the load being switched. Relays are commonly used in applications where a low-power signal from a sensor or control device needs to control a higher power circuit, such as in industrial automation, automotive systems.

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