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Wind power crossword!!

Alan/Chris

Try to solve some wind power words!!!!

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Across
7.the wind speed at which a wind turbine begins to generate electricity
8.a system used to stop the rotor from turning
9.a passive protection for the turbine where the rotors fold up or around the tail vane
10.the shape of the blade cross-section, to enhance the lift and improve turbine performance
13.the energy of a body or a system with respect to the motion of the body or of the particles in the system
17.a energy that doesn't pollute air, land, or water
18.a device to measure wind speed
19.horizontal axis wind turbine
20.the aerodynamic surface that catches the wind
21.a group of wind turbines
Down
1.the body of a propeller-type wind turbine, containing the gearbox, generator, blade hub, and other parts
2.the rotating part of a wind turbine, including the blades and blade assembly, or the rotating part of a generator
3.the ratio of the power extracted by a wind turbine to the power available in the wind stream
4.A turbine having a large vaned wheel rotated by the wind to generate electricity
5.is moving air caused by uneven heating on Earth's surface
6.a type of energy that can be keep on reusing
11.to detect wind direction
12.A tool that uses wind power to mill grain into flour in the old times.
14.One of the first one to use wind power
15.an electronic device for producing a signal voltage
16.vertical axis wind turbine

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