|
Wind can be used to create energy. In the early days wind would turn
windmills, which helped turn a grinding stone helping to grind
agriculture products. Today wind is used in "wind farms" to
harness the energy and convert it to electrical energy. Wind turbines
have large blades to catch the wind, which turns generators to produce
electricity. In many parts of the world, wind power is becoming more
attractive. The Danish are noted for their use of wind power as a major
source of electricity.
There are two types of wind powered turbines the horizontal and
vertical. Horizontal-axis wind turbines have blades that spin in a
vertical plane like airplane propellers. The wind moves rapidly over one
side, creating a low pressure area behind the blade and a high pressure
area in the front. The difference between these two pressures creates a
force which causes the blades to spin. The vertical form uses the same
principles, but have an egg beater look.
|
