Engines - Research Article from Macmillan Encyclopedia of Energy

This encyclopedia article consists of approximately 6 pages of information about Engines.
This section contains 1,708 words
(approx. 6 pages at 300 words per page)
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An engine is a machine that converts energy into force and motion. Possible sources of energy include heat, chemical energy in a fuel, nuclear energy, and solar radiation. The force and motion usually take the form of output torque delivered to a rotating shaft. (Torque is the twisting effort developed around a center of rotation. In an engine it is conceptually quantified by the product of the radius from the center of the output shaft to a second point at which a tangential force is applied, and the magnitude of that applied tangential force.) In contrast, the output of a jet or a rocket engine is simply the thrust force derived from its high-velocity exhaust jet.

Most often the input energy to an engine is derived through combustion of a fuel. The result is a combustion engine. Combustion engines can be classified according to the nature of their...

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This section contains 1,708 words
(approx. 6 pages at 300 words per page)
Buy the Engines Encyclopedia Article
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Macmillan
Engines from Macmillan. Copyright © 2001-2006 by Macmillan Reference USA, an imprint of the Gale Group. All rights reserved.
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