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A '''power source''' is a
* [[Power (physics)]], the rate of doing work; equivalent to an amount of energy consumed per unit time
** [[Electric power]], the rate at which electrical energy is transferred by an electric circuit; usually produced by electric generators or batteries
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* [[Energy carrier]], or secondary energy, a substance or phenomenon that contains energy that can be later converted to other forms such as mechanical work or heat or to operate chemical or physical processes
** [[Fuel]], a material that stores potential energy in forms that can be practicably released and used for work
** See [[Energy
or, often more specifically to an electric power source:
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