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Functioning of wind turbines
The electric power delivered by a wind turbine depends on the length and shape of its blades, the temperature that will vary the density of the air, and of course the speed of the wind.
Wind energy comes from the exploitation of the kinetic energy of the wind. Wind turbines can be installed on land or at sea. These are called onshore wind turbines and offshore wind turbines.
The wind turbine can be part of a wind farm if it is an industrial facility. It can be a small one for a home installation.
Wind energy indirectly benefits from solar energy. The sun is responsible for the temperature and pressure changes that will create winds on the globe.
An electric generator coupled with the wind turbine is used to transform the movement of the blades into direct or alternating current. An auxiliary generator makes the system autonomous.
A single wind turbine can supply up to 7.5 MW, providing electricity to nearly 3,375 households.
The wind turbines are inspired from mills that exist since the year 3000 before J-C. They were created by the Persians. In the nineteenth century, the Netherlands had 8,000 mills, Britain had 10,000, France had 16,000, and Germany 30,000. This explains why the Germans are leaders in the construction of wind turbines.
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