Electricity is a major force of nature. In this section, you can learn how electricity works and what its potential uses are.

How Gasoline Works

Without gasoline, the world as we know it would grind to a screeching halt. The U.S. alone consumes well over a hundred billion gallons of gasoline per year. Learn all about this vital fuel.

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  • Laser


    Laser, a device that generates or amplifies waves of visible light or of such other forms of electromagnetic energy as ultraviolet and infrared radiation. See more »

  • Resistor


    Resistor, a basic component of electric circuits. Resistors are used to produce heat, as in an electric toaster or furnace; to produce light, as in an incandescent light bulb; to provide an electrical bypass, as in the shunt in an ammeter; to regulate the electric power entering a device, as in a light dimmer or radio volume control; and to set voltages within an electric circuit. See more »

  • Semiconductor


    Semiconductor, a material whose electrical conductivity is intermediate between that of a good conductor (such as copper) and that of an insulator (such as rubber). See more »

  • Thermoelectricity


    Thermoelectricity, electricity produced directly from heat. The production of electricity from heat is called the Seebeck effect, after the German physicist Thomas J. See more »

  • Transformer


    Transformer, a device that transfers electric energy from one circuit to another, usually with a change in voltage. See more »

  • What are the different electrical insulators?

    What are the different electrical insulators?

    Electrical insulators are materials that don't conduct electricity because the electrons in the atoms of which they're made don't move around. Learn what the different electrical insulators are in this article. See more »

  • What is voltage?

    What is voltage?

    Voltage is how we measure the difference in electric potential energy. Learn about what voltage is from this article. See more »

  • Arc, Electric

    Arc, Electric

    Arc, Electric, a sustained electric current passing from one solid electrical conductor, or electrode, to another through air or some other gas. See more »

  • Armature


    Armature, the part of an electric generator or motor that contains the main current-carrying winding. See more »

  • Battery, Electric

    Battery, Electric

    Battery, Electric, a device that produces electric current without the use of moving parts. See more »

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