An engine is a mechanical device that produces some form of output from a given input. An engine whose purpose is to produce kinetic energy output from a fuel source is called a prime mover; alternatively, a motor is a device which produces kinetic energy from a preprocessed "fuel" (such as electricity, a flow of hydraulic fluid or compressed air). A motor car (automobile) has a starter motor, a windscreen wiper motor, and motors to drive pumps (fuel, power steering, windscreen washer) –… (More on Engines)