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FACTORS AFFECTING THE EFFICIENCY OF A WIND TURBINE Introduction Windmills convert the wind's kinetic energy into either mechanical or electrical energy. The energy in the wind is stored solar energy. About 5.5% of the suns energy causes difference in temperature and pressure in the atmosphere that drive the winds over the earth's surface. In the eighteenth century, Britain alone is thought to have had some 10,000 windmills (up to 20,000) water mills). Most of these were used for moving water and are still in use as water pumps in some countries. A familiar feature in Western movies. Nowadays, most windmills are used for power generation. Windmills that are used for power generation are called wind turbines. The use of wind machines for power generation is not a new idea, but their number has increased enormously since about 1980. So far the whole wind power industry has settled for 100-500 kW as the preferred...

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