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What is Energy?
Energy in physics is the capacity for doing work. It may exist in potential, kinetic, thermal, electrical, chemical, nuclear, or other various forms. There are, moreover, heat and work—i.e., energy in the process of transfer from one body to another. After it has been transferred, energy is always designated according to its nature. Hence, heat transferred may become thermal energy, while work done may manifest itself in the form of mechanical energy.
Energy can be converted from one form to another in various ways. Usable mechanical or electrical energy is, for instance, produced by many kinds of devices, including fuel-burning heat engines, generators, batteries, fuel cells, and magnetohydrodynamic systems. Similarly, nuclear energy is potential energy because it results from the configuration of subatomic particles in the nucleus of an atom.
Taken From:
" energy ." Encyclopædia Britannica. 2009. Encyclopædia Britannica Online. 9 July 2009 <http://search.eb.com/eb/article-9032627>.
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