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प्रश्न
उत्तर
Earthing is a safety device which is used to prevent shocks due to short-circuiting and leakages. Earthing, means that the metal body of an appliance, or the kWh meter of the house, is connected to a thick copper wire which is buried deep in the earth and at its end ia a copper plate surrounded by a mixture of charcoal and common salt. This prevents the users from getting shocks.
संबंधित प्रश्न
To which wire of a cable in a power circuit should the metal case of geyser be connected.
An electric iron is rated 220V, 2kW.
1) if the iron is used for 2h daily find the cost of running it for one week if it costs 4.25 per kWh
2) Why is the fuse absolutely necessary in a power circuit?
What do you mean by the term local earthing? Explain how it is done.
The metal case of an electric appliance is earthed explain the reason.
- The earthing of an electric appliance is useful only if the fuse is in the live wire. Give the reason.
- Name the part of the appliance which is earthed.
For earthing an electrical appliance, one has to remove the paint from the metallic body of the appliance where the electrical contact is made. Explain the reason.
Why is it necessary to have an earth wire installed in a power circuit, but not in a lighting circuit?
What is meant by earthing of an electrical appliance? Why is it essential?
In a three-pin plug top, one of the pins is thicker and longer than the other two, Give reason. Name this pin.
