27) What is the use of earthing wire?
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Answer:
Earthing is used to protect you from an electric shock. It does this by providing a path (a protective conductor) for a fault current to flow to earth. It also causes the protective device (either a circuit-breaker or fuse) to switch off the electric current to the circuit that has the fault.
Explanation:
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Answer:
1)The process of transferring the immediate discharge of the electrical energy directly to the earth by the help of the low resistance wire is known as the electrical earthing.
2)The electrical earthing is done by connecting the non-current carrying part of the equipment or neutral of supply system to the ground.
3)Mostly, the galvanised iron is used for the earthing.
4)The earthing provides the simple path to the leakage current. The shortcircuit current of the equipment passes to the earth which has zero potential.
Thus, protects the system and equipment from damage.
EXTRA
THERE ARE TWO TYPES OF EARTHING WIRES
1.Neutral Earthing
2.Equipment Earthing