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] ]


The '''joule''' (J) is the ] unit of ] and ], and is defined as 1 ] ]<sup>2</sup> ]<sup>-2</sup> = 1 ] ] = 1 ] ]. It is named in honour of the physicist ]. The '''joule''' (J) is the ] unit of ] and ], and is defined as 1 ]·]<sup>2</sup>·]<sup>-2</sup> = 1 ]·] = 1 ]·]. It is named in honour of the physicist ].


One joule is the work required to exert a force of 1 Newton for a distance of 1 metre, so the same quantity may be referred to as a '''newton metre'''. That is the work required to lift a mass of ] (e.g. a small apple) for one metre under the earth's gravity. One joule is the work required to exert a force of one newton for a distance of one metre, so the same quantity may be referred to as a '''newton metre'''. However, to avoid confusion the newton metre is usually used as a measure of ], not energy. Another way of visualizing the joule is the work required to lift a mass of ] (e.g. a small apple) for one metre under the earth's gravity.


One joule is also the work done to produce power of 1 watt for 1 second, such as when somebody takes 1 second to lift the small apple mentioned above through 1 metre under the earth's gravity. One joule is also the work done to produce power of one watt for one second, such as when somebody takes one second to lift the small apple mentioned above through one metre under the earth's gravity.


1 joule is equal to: 1 joule is equal to:
* 0.000,000,278 ]s * 0.000,000,278 ]s
* 0.239 ]s * 0.239 ]s
* 0.000,948 ]s * 0.000,948 ]s
* 0.738 foot pounds force * 0.738 foot pounds force
* 1 Ws (] ]) * 1 W·s (] ])
* 1 Nm (] ]) * 1 N·m (] ])
* 23.7 foot poundals * 23.7 foot poundals
* 10,000,000 ]s * 10,000,000 ]s
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See ] for further comparisons. See ] for further comparisons.


See also: ], ], ], ] See also: ], ], ], ]


== External link == == External link ==

Revision as of 18:05, 3 November 2003


The joule (J) is the SI unit of energy and work, and is defined as 1 kg·m·s = 1 N·m = 1 W·s. It is named in honour of the physicist James Prescott Joule.

One joule is the work required to exert a force of one newton for a distance of one metre, so the same quantity may be referred to as a newton metre. However, to avoid confusion the newton metre is usually used as a measure of torque, not energy. Another way of visualizing the joule is the work required to lift a mass of 102 g (e.g. a small apple) for one metre under the earth's gravity.

One joule is also the work done to produce power of one watt for one second, such as when somebody takes one second to lift the small apple mentioned above through one metre under the earth's gravity.

1 joule is equal to:

See 1 E0 J for further comparisons.

See also: conversion of units, eV, kW·h, TW·h

External link