Energy

Water Wheel
Description: A wheel used to create energy by running water.

Power Generator
Description: This n electric generator is a device that converts mechanical energy to electrical energy. The reverse conversion of electrical energy into mechanical energy is done by a motor
Keywords: power, electric, power generator, alternator, engine, energy conversion, dynamo, direct current

Windmill
Description: A windmill is a machine that is powered by the energy of the wind. It is designed to convert the energy of the wind into more useful forms using rotating blades or sails. The term also refers to the structure it is commonly built on. In much of Europe, windmills served originally to grind grain, though later applications included pumping water and, more recently, generation of electricity.

Steam locomotive

Description: External-combustion engine in which heat is used to raise steam which either turns a turbine or forces a piston to move up and down in a cylinder