Energy can be defined as a property of physical objects or fields to do work on other physical systems, while the work is defined as a force acting through a distance and consequently energy is equivalent to the ability to exert pulls or pushes against the basic forces of nature, along a path of a certain length.
In the International System of Units Energy and Work are measured in Joules (J), however in specific fields other units are also often used (like kilowatt-hours and kilocalories).
These online unit converters are designed to support fast and accurate conversion among several units of energy, from one system into another.
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SPRINGER London, New York, Heidelberg, xxiv, 848 pages (2005)