Question

what is the function of an Earth wire why it is necessary to earth metallic bodies of electrical appliances

Answer 1

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The function of earth wire is to transfer the excess amount of electricity into the earth due to these the appliance us is safe when overloading of the current occurs

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Answer 2

Earth wire ensures any lekage of current to the metallic body of the appliance and keeps it's potential difference to that of Earth and the user may not get a severe shock.