Engine

What is engine? or what is the use of an engine?

Engine is a device which convert one form of energy to another.

For example, Heat engine is one type of engine which is a device which convert chemical energy of the fuel to the heat energy & further convert this heat energy to mechanical energy.

This we have experienced in our real life where we fill petrol or diesel in our vehicle & if we start the vehicle, combustion of the fuel takes place. So the chemical energy of the fuel, once burn convert to heat energy and this heat energy is converted to mechanical energy which helps in the movement of the wheels of the vehicle, as a result our vehicle moves.