The device is called a switch.
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A switch is a common device used to open and close an electric circuit. It allows users to control the flow of electricity by physically moving a component to make or break the connection. Switches are commonly found in household appliances, lighting systems, and electronic devices.
Without an electric switch in a circuit, there would be no way to control the flow of electricity and therefore no way to turn the circuit on or off. The circuit would remain continuously powered, potentially leading to overheating, damage to components, or safety hazards.
When a plug key is open , the circuit is incomplete and is call open circuit.. To be continued..
An open circuit.
The type of circuit you are describing is known as a simple circuit. It consists of a power source (electric cell), a switch, a conductor (usually wire), and a resistor to control the flow of electric current.
A switch, circuit breaker, fuse, or switching transistor can do that.