Question

what is the function of earth wire in electrical instruments, why it is necessary to earth the metallic electrical appliances

Answer 1

the earth wire is connected into the earth in a metal plate . the function of the earth wire is to protect the individual using metal appliances  from immediate electric shock . it is necessary to earth metallic appliances for the safety of the person using it.

Answer 2

To avoid risk of electric shocks,the metal body of appliances is earthed.The metal case of the appliances is connected to earth by means of a metal wire called earth wire

The appliances are connected to the earth by using the top pin of a 3-pin plug.And earthing save us from electrical shocks.

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