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प्रश्न
Explain the principle of working of the windmill for generating electricity.
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उत्तर
It works on the principle of conversion of the kinetic energy of blowing wind into electrical energy. When the blowing wind strikes across the blades of a windmill it exerts a force that rotates its blade. The turning of the blades would simultaneously cause the shaft to turn, which is connected to a generator. This makes the generator produce electricity.
संबंधित प्रश्न
A certain form of energy which is not sourced directly or indirectly from the sun and does not cause any pollution is very easily converted into electricity. This form of energy is, however, not available everywhere. Moreover, it is technically very difficult and expensive to obtain it. Name the form of energy.
A ball is made to fall freely from a height. State the kind/ kinds of energy possessed by the ball when it is at the ground.
Name the form of mechanical energy, which is put to use.
Select the renewable and non-renewable sources of energy from the following:
Oil
Name the energy changes for the following:
bicycle brakes
A ball of mass 0.5 kg slows down from a speed of 5m/s-1 to that of 3m/s-1. Calculate the change in kinetic energy of the ball.
Write five forms of energy.
How much hydro-electric power is generated in India?
Give one example when:
Sound energy changes to electric energy.
Match the pairs.
| Group 'A' | Group 'B' | ||
| (1) | Rolling object | (a) | Heat energy |
| (2) | Food | (b) | Atomic energy |
| (3) | Stretched bow | (c) | Kinetic energy |
| (4) | Sunlight | (d) | Potential energy |
| (5) | Uranium |
(e)
|
Chemical energy
|
