Wind Power and Hydropower

Wind power is generated by the force wind exerts on the blades of a turbine, causing the shaft of the turbine to rotate at a speed of 10 to 20 revolutions per minute (rpm). The shaft is connected to an alternator that converts mechanical energy into electrical energy.

wind speed (main factor) the area swept by the blades air density

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	a minimum wind speed (generally 12–14 km/h), to begin to turn and generate electricity strong winds (50–60 km/h) to generate at full capacity winds of less than 90 km/h; beyond that speed, the turbines must be stopped to avoid damage