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Q.

A device that closes or opens a circuit is known as [[1]].


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answer is SWITCH.

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Detailed Solution

A device used to close or open a circuit is known as a switch.
“A switch is a device used to break or make an electrical circuit”. When the switch is in the 'ON' position, the circuit is entirely called an open circuit, and current can flow through it.
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A device that closes or opens a circuit is known as [[1]].