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What is the function of an earth wire ?...

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

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Function of an earth wire : The function of an earth wire is to provide a low-resistance conducting path to the current leaking from an electrical appliance to the earth and thereby pervent electric shock to the user of the electrical appliance .
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KUMAR PRAKASHAN-MAGNETIC EFFECTS OF ELECTRIC CURRENT -VALUE BASED QUESTIONS WITH ANSWERS
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