Question

Explain the importance of using in a household electric circuit
(i) Fuse, and
(ii) Earthing wire.

Answer 1

The fuse is basically a piece of wire composed of pure tin or alloy of tin and copper which is having low melting point and high resistance. When high current flows in the circuit whatever may be the reason short circuit etc, the fuse wire melts and circuit is broken and the appliances are saved from damage.

The metal body of the appliance are connected to the earth wire which in turn is attached with the copper plate buried deep in the ground. This earthing helps in keeping the appliance and the earth at same potential so that if we touch the body we don’t get any shock.