Answer:
Switch
Step-by-step explanation:
A switch is used to connect or disconnect a circuit.
The electric device, a switch, has the ability to make/break a circuit. The circuit is not complete when it disconnects and is off. When it's off, it is then called an open circuit which does not allow an electric current to circulate around the circuit. When it is on, it does the complete opposite and allows electric current to run through it.