Question

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

Answer 1

(i) Fuse
A fuse is an important device that disconnects the electricity supply when short circuit or overloading occurs.
It is a short-length wire of low melting point that is used to protect the household electrical system from getting damaged. It also avoids danger of electric fires due to unusual high current. This unusual high current may be due to short circuit, overloading etc.

(ii) Earthing wire
Earthing wire is a safety wire. It connects the metal parts of an appliance to the ground. It is accomplished by thick copper wires. Earthing protects the appliance and human beings in case of insulation failure or accidental short circuit.