A wind turbine is a device that converts kinetic energy from the wind into mechanical energy. If the mechanical energy is used to produce electricity, the device may be called a wind generator or wind charger. If the mechanical energy is used to drive machinery, such as for grinding grain or pumping water, the device is called a windmill or wind pump. The smallest turbines are used for applications such as battery charging or auxiliary power on sailing boats; while large grid-connected arrays of turbines are becoming an increasingly large source of commercial electric power. (http://en.wikipedia.org/wiki/Wind_turbine)
According to which the propeller rotates, there are two types of wind turbine. One is a horizontal-axis wind turbine and the other is vertical-axis wind turbine. Compared with vertical-axis turbine, the horizontal-axis is more common because it is easier to install and the efficiency of transforming wind power is higher.
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