Answers

2016-02-16T23:25:12+05:30
It prevents us from getting shock when there is excess flow of current
it prevents shortcircuiting
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2016-02-17T09:15:46+05:30
Whenever the extra current gets accumulated in the metallic body of any appliance, the earth wire transfers this current towards the earth. Which prevents us from electric shock. This takes place because earth is considered to be at zero.
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