Re Theory.docx

Theory: The kinetic energy contained in the wind can be converted into both mechanical and electrical energy by a windmill. A modern type of windmill that uses the kinetic energy of the wind to produce an electrical energy output is called a Wind Turbine Wind turbines that are in use today are far more likely to be a type of wind generator which operates differently and more efficiently from a conventional sail windmill. Multiple wind turbines that are arranged together in clusters to capture large amounts of wind energy at the same time and convert it into electrical power feeding this power into the electrical grid are known as Wind Farms. The wind rotates the turbines rotor blades around a central hub, which turns a low speed gearbox shaft, which rotates a generator at a higher speed and makes electricity. The electrical generator converts the kinetic energy of the rotating blades into electrical energy were electrical cables carry this energy to an electrical sub-station for distribution to the utility grid. At any given site, the wind speed can vary from zero to high gusts, so wind speed is important because the amount of electricity that wind turbines can generate is determined by the winds actual speed or velocity. It can be measured using a weather vane or a type of wind gauge known scientifically as an Anemometer. An Anemometer is a device used to measure the velocity and direction of the wind giving us an idea of the amount of wind energy available at a particular location.

Fig. wind turbine

Unknown, Alternative energy tutorials ,Wind Energy Turbines Convert Wind into Electricity, From http://www.alternative-energy-tutorials.com/wind-energy/wind-energy.html