What is the function of an earth wire? Why is it necessary to earth metallic appliances?
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.