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A steam engine is a heat engine that performs mechanical work using steam as its working fluid.
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An electric motor is an electrical machine that converts electrical energy into mechanical energy. The reverse of this would be the conversion of mechanical energy into electrical energy and is done by an electric generator.
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a cell producing an electric current directly from a chemical reaction.
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The telegraph is an outdated form of communication as far as sending long-distance messages goes. It uses an electric signal broken to create a code that then transmits over a wire and translates into a message.
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a glass bulb inserted into a lamp or a socket in a ceiling, that provides light by passing an electric current through a filament or a pocket of inert gas.
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An electric current that reverses direction in a circuit at regular intervals.
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a turbine having a large vaned wheel rotated by the wind to generate electricity.
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power obtained by harnessing the energy of the sun's rays.
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A geothermal power plant is a facility which converts natural heat from the earth's interior into usable electricity.
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a device that generates an electric current or voltage dependent on the degree of illumination.
