A turbine is a machine in which the kinetic energy of a moving fluid causes a series of blades to spin, thus converting kinetic energy to mechanical power. The fluid may be a liquid such as water or a gas such as air, natural gas, or steam. The blades are connected to a shaft so that the motion of the blades spins the shaft, and this can be used to perform work such as spinning a generator.
Turbines may be powered by a variety of sources of kinetic energy including flowing water, steam, flowing air (wind), or by a mixture of hot air and gas created by combusting a fuel such as natural gas or petroleum. Common turbines used in today’s electric industry include: