WIND ENERGY
WIND ENERGY
Wind
is moving air. It moves from one place to another place as a result of natural
force. The wind blows because cool air is continually moving to replace rising
warm air.
As
the sun warms up different parts of the earth’s surface, the air above is also
warmed. Warmed air becomes lighter and rises above surrounding cold air. In
other places, the air cools, become heavier and falls down.
Anemometer
is an instrument for measuring speed of the wind. It has three or four cups at
the end of arms which blow around slowly in a light breeze. The faster the wind
blows, the faster the cups spin around.
Anemometer
Wind energy can move a windmill and
blow a sailing boat
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