Question

what is a earth wire?

Answer 1

Answer:

In electrical engineering, ground or earth is the reference point in an electrical circuit from which voltages are measured, a common return path for electric current, or a direct physical connection to the earth. Electrical circuits may be connected to ground for several reasons.

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Answer 2

Earth wire is generally yellow or green colour, it is converted to a metal plate buried deep underground near the house and is for safety purpose.