What is the function of an earth wire ?

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

Earth wire acts as a safety measure. When the live wire touches the metallic casing of an electric appliance, the electric current flows from the casing of the appliance to the earth through the copper wire. An electric current flows along the path of low resistance thus, current passes through the copper wire instead of human body. Thus, the human body is saved from electric shock.

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