Wednesday 13 August 2014

Joule

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This COMMODITY is about the assemblage of energy. For added uses, see Joule (disambiguation).
Joule
Unit system SI acquired unit
Unit of Energy
Symbol J 
Named after James Prescott Joule
Unit conversions
1 J in ... ... is according to ...
SI abject units 1 kgВ·m2/s2
CGS units 1Г—107 erg
kilowatt hours 2.78Г—10в€’7 kWв‹…h
kilocalories 2.39Г—10в€’4 kcal
BTUs 9.48Г—10в€’4 BTU
electronvolts 6.24Г—1018 eV
The joule (/ˈdʒuːl/ or sometimes /ˈdʒaʊl/), attribute J, is a acquired assemblage of energy, work, or bulk of calefaction in the International System of Units.[1] It is according to the activity expended (or plan done) in applying a force of one newton through a ambit of one accent (1 newton accent or N·m), or in casual an electric accepted of one ampere through a attrition of one ohm for one second. It is called afterwards the English physicist James Prescott Joule (1818–1889).[2][3][4]
In agreement firstly of abject SI units and again in agreement of added SI units:
\rm J = {}\rm \frac{kg \cdot m^2}{s^2} = N \cdot m = \rm Pa \cdot m^3={}\rm W \cdot s = C \cdot V
where kg is the kilogram, m is the metre, s is the second, N is the newton, Pa is the pascal, W is the watt, C is the coulomb, and V is the volt.
One joule can aswell be authentic as:
The plan appropriate to move an electric allegation of one coulomb through an electrical abeyant aberration of one volt, or one '"coulomb volt" (CВ·V). This accord can be acclimated to ascertain the volt.
The plan appropriate to aftermath one watt of ability for one second, or one "watt second" (WВ·s) (compare kilowatt hour). This accord can be acclimated to ascertain the watt.
Contents [hide]
1 Usage
2 Confusion with newton-metre
3 Practical examples
4 Multiples
4.1 Nanojoule
4.2 Microjoule
4.3 Millijoule
4.4 Kilojoule
4.5 Megajoule
4.6 Gigajoule
4.7 Terajoule
4.8 Petajoule
4.9 Exajoule
4.10 Zettajoule
4.11 Yottajoule
5 Conversions
6 See also
7 Notes and references

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