Question

what is the function of an earth wire? why is it necessary to earth metallic appliances

Answer 1

earth wire posses extra electric energy to appliances and it is not necessary for all appliances only big appliances like computer laptop

Answer 2

The main function of the earth wire is to prevent live wire from overloading and absorbs the excess electrons & flows to beneath the ground . It isnecessary because it prevents the electrical appliances from damage and absorbs the excess electricity from appliances.