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Wind energy |
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Winds are convection currents in the air. Since wind is moving air, it possesses kinetic energy. The energy of moving air or the wind energy has been used for running windmills for a long time. Nowadays, windmills are used for generating electricity. When the blowing wind strikes the blades of the windmill, it exerts a force on them due to which the blades of the windmill start rotating. As long as the wind is blowing, the blades of the windmill keep on rotating. This is turn continuously rotates the shaft. The rotating shaft rotates the armature inside the generator. The rotating armature produces electric current. Thus, kinetic energy of the wind is converted into electrical energy by windmill. The electricity produced by a single windmill is very small. Therefore, a large number of windmills are erected over a large area, which is known as wind energy farm. Wind energy farms can be established only at those places where wind blows for a greater part of the year. Moreover, the wind should be strong and steady. The minimum wind velocity should be 15km/hr. Wind energy can therefore be utilized only in certain areas. Wind although circulatory and inconsistent contains terrific amounts |
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