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Earthing

If a person t...

Question

If a person touches the appliance, his body provides a path for current to flow to earth which is at ............ potential.

A

Infinite

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B

low

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C

high

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D

zero

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Solution

The correct option is D zero
If a person touches the appliance, his body provides a path for current to flow to earth which is at zero potential.Thus, person may get severe shock which may prove fatal. Hence, fuse is connected to live wire so that if it melts, the appliance is no longer connected to the high potential of the supply and possibility of electric shock is eliminated.

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Q. If two points are at different potentials , then the current will flow till the time both the points reach the same potential( without a battery).
Now the question is that - If we connect the switch in the neutral wire, when the switch is off, the appliance is connected to the higher potential through the live wire ( which was not disconnected), the current flows through the live wire to the appliance . If we now touch the appliance, we will get shock because the appliance was at higher potential and our body was at a lower potential, thus current moved Through our body. But even if we wear rubber shoes ( or some insulation between our body and earth is there) , we should get shock because the only change that happens now is that the current doesn't reach ground. But it will flow TO our body (lower potential ) from the live wire (higher potential) even if there is not a return path for current ( not a complete circuit). Why is this not true ?

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Earthing is provided for electrical appliances in a building to protect it from ______.

Name a device which is used to allow current to flow into the appliance and cut it off.

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