Depends how big the windmill is.
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http://www.answers.com/main/ntquery?s=windmill&gwp=13
windmill is a process of contain electricity.
Advantages1. wind to harness electricity2. Environmentally friendly, does not produce green house gasesDisadvantages1. Reliability.The output power of a windmill depends on the speed of the wind.If wind is not strong in the area, the windmill will not generate enough power to grind grain to flour, or, will grind only some grain. Thus building windmills in this type of areas will be useless.2.Noise pollution is also another problem. When rotating, the vanes of the windmill make a considerable amount of noise.3. A lot of resources needed
The windmill was made in stop cheating do your homework
They were built because the windmill allowed the farmers and their families to have electric lights and radio.