(a) Draw a schematic labelled diagram of domestic electric circuit.
(b) Why is it necessary to provide–
(i) A fuse in an electric circuit
(ii) An earth wire to electric application metallic body? Explain.
A fuse in an electric circuit prevents any damage to electrical appliances due to short-circuit or overloading.
The main function of the earth wire is to conduct the excess or the leaking current from the electrical appliance to the ground.
It is necessary to earth metallic bodies because it protects us from getting an electric shock by transferring the current to the earth
Because, if the metallic bodies of electric appliances are earthed, then the current would flow directly into the earth rather than entering our body.
Hence, we won't get an electric shock.