An electromechanical or solid-state relay is a _____ operated switch.

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Multiple Choice

An electromechanical or solid-state relay is a _____ operated switch.

Explanation:
Relays are actuated by an electrical control signal. In an electromechanical relay, energizing a coil creates a magnetic field that moves the contacts, while in a solid-state relay the input signal switches semiconductor devices. In both cases, the trigger is electrical, not driven by mechanical motion or by air or fluid pressure. So it’s an electrically operated switch. The other options describe actuation methods that use mechanical, pneumatic, or hydraulic power, which isn’t how relays operate.

Relays are actuated by an electrical control signal. In an electromechanical relay, energizing a coil creates a magnetic field that moves the contacts, while in a solid-state relay the input signal switches semiconductor devices. In both cases, the trigger is electrical, not driven by mechanical motion or by air or fluid pressure. So it’s an electrically operated switch. The other options describe actuation methods that use mechanical, pneumatic, or hydraulic power, which isn’t how relays operate.

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