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** Energy **

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"Energetic" redirects here. For other uses, see Energetic (disambiguation).
This article is about the scalar physical quantity. For an overview of and
topical guide to energy, see Outline of energy. For other uses, see Energy

This article *duplicates, in whole or part, the scope of other article(s)
or section(s)*. Please discuss this issue on the talk page and conform with
Wikipedia's Manual of Style by replacing the section with a link and a
summary of the repeated material, or by spinning off the repeated text into
an article in its own right. /(November 2012)/

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Energy transformation; In a typical lightning strike, 500 megajoules of
electric potential energy is converted into an equivalent amount of light
energy, sound energy and thermal energy.

In physics, *energy* is an indirectly observed quantity which comes in many
forms, such as kinetic energy, potential energy, radiant energy, and many
others; which are listed in this summary article. This is a major topic in
science and technology and this article gives an overview of its major
aspects, and provides links to the many specific articles about energy in
its different forms and contexts.

The question "what is energy?" is difficult to answer in a simple,
intuitive way, although energy /can/ be rigorously defined in theoretical
physics.^[/citation needed/] In the words of Richard Feynman, /"It is
important to realize that in physics today, we have no knowledge what
energy is. We do not have a picture that energy comes in little blobs of a
definite amount."/^[1]

However, it is clear that energy is always an indispensable prerequisite
for performing mechanical work, and the concept has great importance in
natural science. The natural


what is energy

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