Wind Energy
Wind Energy
Wind Energy:
A moving mass of air is called wind. Let us see, with the help of an example, what causes wind. Daring the day, the land near the sea heats up faster than the water of the sea. Therefore, the air over the land heats up faster than that over the sea. The warm air over the land rises, and to take its place the colder air from the sea moves towards the land. This moving air is called wind. Similarly, winds arise whenever two adjoining areas on the surface of the earth are unequally heated by the sun. Like any moving object, wind has kinetic energy. Clearly, the ultimate source of this energy is the sun.
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The invention of the windmill made it possible to do things like grind grain at mills and lift water with the help of wind energy. A windmill is a device in which the energy of the wind is used to rotate a set of blades, and the rational energy of the blades is used to do some work. The blades of a modern windmill make it look like a fan mounted on a tall column. The blades are kept high above the ground to catch the wind.
A wind-electric generator works only on winds of at least __________________ speed. | |||
| Right Option : B | |||
| View Explanation | |||
Which of the following are advantages of wind energy . | |||
| Right Option : D | |||
| View Explanation | |||
Which of the following are correct ? (a) The cause of wind is the fact that during the day, the land near the sea heats up slower than the water of the sea. (b) Generators are set up in a large area, called a wind farms the combined electrical outputs of all the generators are then used to supply power. (c) It is expensive to set up a wind farm for generating electricity because wind farms need large area. | |||
| Right Option : B | |||
| View Explanation | |||
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