A wind turbine is a device that converts the kinetic energy of wind into electrical energy. As of 2020 , hundreds of thousands of large turbines, in installations known as wind farms, were generating over 650 gigawatts of power, with 60 GW added each year. Wind turbines are an increasingly important source of intermittent renewable energy, and are used in many countries to lower ener. Type:ElectricitySize:5x5 cells (4 radius)Unlock:Start*Cost:₡6,000Watch full videoHistoryThe windwheel of (10–70 CE) marks one of the first recorded instances of wind powering a machine. However, the first known practical wind power plants were built in , an Eastern pro. .
(WPD) is a quantitative measure of wind energy available at any location. It is the mean power available per swept area of a turbine, and is calculated for different heights above ground. Calculation of. .
requires that the mass of air entering and exiting a turbine must be equal. Likewise, the requires the energy given to the turbine from incoming wind to be equal to that of the c. .
Wind turbines can rotate about either a horizontal or a vertical axis, the former being both older and more common. They can also include blades or be bladeless. Household-size vertical designs produce less power.
