Joule

Joule - Wikipedia, the free encyclopedia
For the electric car, see Optimal Energy Joule. The Joule is the derived unit of energy in the International System of Units. It is defined as: ...
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James Prescott Joule - Wikipedia, the free encyclopedia
Joule studied the nature of heat, and discovered its relationship to mechanical ... The SI derived unit of energy, the joule, is named after him. ...
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joule: Definition from Answers.com
joule n. ( Abbr. J or j ) The International System unit of electrical, mechanical, and thermal energy ... Hence the practical joule. ...
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The joule (International Phonetic Alphabet: or ) (symbol: J) is the SI unit of energy. It was named after James Prescott Joule for his work on the relationship between Joule heating, electricity and mechanical work.

Description One joule is the work done, or energy expended, by a force of one newton moving an object one metre along the direction of the force. This quantity is also denoted as a Newton-meter with the symbol N·m. Note that torque also has the same units as work, but the quantities are not identical. In elementary units: 1\, \mathrm{J}=1\, \mathrm{kg} \cdot \frac{\mathrm{m}^{2-->{\mathrm{s}^{2-->

One joule is also:

The work required to move an electric charge of one coulomb through an electrical potential difference of one volt; or one coulomb volt, with the symbol C·V.
The work done to produce power of one watt continuously for one second; or one watt second (compare kilowatt-hour), with the symbol W·s.

History A joule is the mechanical equivalent of heat meaning the number of units of work in which the unit of heat can perform.. Its value was found by James Prescott Joule in experiments that showed the mechanical energy Joule's equivalent, and represented by the symbol J. The term was first introduced by Dr. Mayer of Heilbronn.

Conversions 1 joule is exactly 107 ergs.

1 joule is approximately equal to:

6.24150636309 eV (electronvolts)
0.238845896628 cal (calorie) (small calories, lower case c)
2.390 kilocalorie, Calories (food energy, upper case C)
9.47817120313 BTU (British thermal unit)
0.737562149277 ft·lbf (foot-pound force)
23.7 ft·pdl (foot poundals)
2.7778 kilowatt-hour
2.7778 watt-hour
9.8692 litre-atmosphere (unit)

Units defined in terms of the joule include:

1 thermochemical calorie = 4.184 J
1 International Table calorie = 4.1868 J
1 watt-hour = 3600 J
1 kilowatt-hour = 3.6 J (or 3.6 MJ)

Useful to remember:

1 joule = 1 newton-meter = 1 watt-second

1 joule in everyday life is approximately:

the energy required to lift a small apple (102 gram) one meter against Earth's gravity.
the amount of energy, as heat, that a quiet person produces every hundredth of a second.
the energy required to heat one gram of dry, cool Earth's atmosphere by 1 degree Celsius.
one hundredth of the energy a person can get by drinking a single 5 mm diameter droplet of beer.

=== SI multiples ===

{{SI multiples|unit=joule|symbol=J|note=Common multiples are in bold face|m=|k=|mc=|M=|n=|G=|p=|T=-->

See also

Conversion of units
SI prefixes
Orders of magnitude
Orders of magnitude (energy)
Electronvolt
Watt-hour
Fluence
Foe (unit of energy)

References

The adoption of joules as units of energy, FAO/WHO Ad Hoc Committee of Experts on Energy and Protein, 1971. A report on the changeover from calories to joules in nutrition.

External links

Unit conversion from joule
Online Joule Converter

Joule - Wikipedia, the free encyclopedia
The joule (written in lower case, pronounced /ˈdʒuːl/ or /ˈdʒaʊl/) (symbol: J) is the SI unit of energy measuring heat, electricity and mechanical work.

James Prescott Joule - Wikipedia, the free encyclopedia
James Prescott Joule FRS (pronounced /ˈdʒuːl/; [1] December 24, 1818 – October 11, 1889) was an English physicist (and brewer), born in Salford, Lancashire.

Joule Centre
The Joule Centre for Energy Research is a partnership of North West Universities, commercial organisations and other stakeholders associated with the energy industry

Definition: joule from Online Medical Dictionary
The Online Medical Dictionary is a searchable dictionary of definitions from medicine, science and technology.

Joule Events - Julie Flavell - Event Management - Production ...
Looking ahead, Joule is planning for more Special Olympics events in the spring and summer 2008, while preparations for the Shoreditch Festival in August are well underway.

James Joule
So, who was James Prescott Joule? James Prescott Joule was born on 24th December 1818 in Salford, Lancashire, England. He came from a wealthy family who were involved in the ...

GCSE Physics: The joule (J)
Tutorials, tips and advice on GCSE Physics coursework and exams for students, parents and teachers.

Make a Joule thief.
Make a joule thief. This project has moved.... HERE! You can find the rest of the site at the link below. www.bigclive.com

Joule Consulting Engineers
A consulting structural engineering practice based in the centre of Manchester.

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