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It is necessary to connect an earth wire to electric appliances having metallic covers. Why? How will you identify earth wire in household circuit ?

Answer»

Solution :The earth wire is connected to a metallic plate deep inside the earth. In this way, the metallic BODY of APPLIANCE is connected to the earth, which PROVIDES a low resistance conducting path for electric current. HENCE, any lea.lcage of current to the metallic body of appliance keeps the potential to that of earth. The user might not get a severe electric SHOCK on touching such an appliance.
Earth wire has green insulation, so it can be indentified.


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