Question

The device used to protect electric circuit is ____________(fuse /battery ).

Answer 1

1. A fuse is an electrical safety device, that is connected to the circuit, to protect the electrical circuit and the devices in the circuit from the excess passage of current through it.
2. Fuse works on the principle of the heating effect of electric current.
3. A fuse consists of a narrow wire called fuse wire which gets heated and breaks off if any excess current flows through the circuit.
4. If the wire breaks it becomes an open circuit.

Hence, the device used to protect electric circuit is fuse.