Wind Energy

Wind Energy

Wind Energy

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Wind Energy,energycontainedin the force of the winds blowing across the earth's surface. When harnessed, wind energy can be converted into mechanical energy for performing work such as pumping water, grinding grain, and milling lumber. By connecting a spinning rotor (an assembly of blades attached to a hub) to an electric generator, modern wind turbines convert wind energy, which turns the rotor, into electrical energy.

Windiscreatedwhenair that has been warmed over sun-heated land rises, leaving a vacuum in the space it once occupied. Cooler surrounding air then rushes in to fill the vacuum. This movement of rushing air is what we know as wind.

Egyptiansmayhavebeen the first to capture wind energy when they sailed boats up the Nile River beginning around the 4th century bc. For centuries afterward, wind-powered sailing vessels plied the world's seas and oceans, serving as the principal form of commercial transport. Wind energy has been harnessed on land since the first windmill was developed by the ancient Persians in the 7th century ad. Windmills have since been used to mill grain, pump water, saw timber, and provide other forms of mechanical energy.

Becausewindisaclean and renewable source of energy, modern wind turbines are being installed in countries such as Germany, Denmark, India, China, and the United States to supplement more traditional sources of electric power, such as burning coal. Design improvements such as more efficient rotor blades combined with an increase in the numbers of wind turbines installed, have helped increase the world's wind energy generating capacity by nearly 150 percent since 1990. In 1997, for example, the world market for wind energy reached $3 billion.

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