Question

The device used to close or open an electric circuit is ____________​

Answer 1

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switches

A device designed to open or close a circuit under controlled conditions is called a switch. The terms “open” and “closed” refer to switches as well as entire circuits. An open switch is one without continuity: current cannot flow through it.

Answer 2

Answer:

Switch . A switch is a device used to open or close an electric circuit .

Explanation:

A key is also a right answer.