WIND ENERGY

Wind power is the product of the conversion of the kinetic energy of wind into electricity . To harness the energy of the wind turbines are used.

The principle is the same as the old windmills that the wind pushes the blades in this case, the rotation of the blades is transmitted to a generator that produces electricity. 
More wind turbines together make up the wind farm, "wind farms "real power in which the turbines are located at a distance apart equal to 5 / 10 times the diameter of the blades, so in the case of wind turbines will be installed an average every 200 meters. 
Of course, the wind turbines must be installed in particularly windy. To select where to install a wind turbine must be considered: 
the shape of the land (there are 4 classes of roughness of the ground; such as rough, ie with abrupt changes in elevation, forests, mountains, etc.. more the wind will encounter obstacles that will reduce its speed ) 
the time course of direction and wind speed. The wind is not constant changes of strength and direction to classify according to the direction is used to define the place from which eg. Sirocco from Syria etc..; to classify according to the force is used or the extent of its speed or nodes (a node corresponds to a mile per hour) or the Beaufort scale, which provides a scale of 0 to 12 depending on the speed increased of the wind.