Turbines work by converting the kinetic energy of a moving fluid like water, steam, gas or wind into mechanical rotational energy. There are several types of turbines including impulse turbines which use fluid velocity changes and reaction turbines which use pressure changes as the fluid moves through the turbine. Common turbine types are water turbines like the Pelton, Francis and Kaplan turbines which use water, steam turbines which power electric generators in power plants, gas turbines which power vehicles and aircraft, and wind turbines which convert wind energy into electricity.