Question

10) The earthwire which is of green colour is connected to metal plate. Why?​

Answer 1

In our homes, we receive supply of electric power through a main supply (also called mains), This is used as a safety measure, especially for those appliances that have a metallic body, for example, electric press, toaster, table fan, refrigerator, etc.

Answer 2

If by chance,live wire touches the metallic body of the appliance, the extra current flows through earth wire. So it is used as safety measure which ensures any leakage of current to any metallic body. It consumes is zero voltage and the user may not get a severe electric shock