___ is a device which controls (prevents or allows) current to flow through it.

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Solution

A switch prevents or allows current to flow through it. It is a device for making and breaking connections in an electric circuit. For example, when anyone presses the button (switch) for light/fan when he/she enters the room.

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Similar questions

The device which is used to allow current to flow in a circuit or cut it off when desired is called ____________.

Name a device which is used to allow current to flow into the appliance and cut it off.

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