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Encyclopedia > Joule

The joule (IPA: [dʒuːl] or [dʒaʊl]) (symbol: J) is the SI unit of energy. It was named after James Prescott Joule for his work on the relationship between heat, electricity and mechanical work. Articles with similar titles include the NATO phonetic alphabet, which has also informally been called the “International Phonetic Alphabet”. For information on how to read IPA transcriptions of English words, see IPA chart for English. ... The International System of Units (symbol: SI) (for the French phrase Système International dUnités) is the most widely used system of units. ... James Joule - English physicist James Prescott Joule, FRS (December 24, 1818 – October 11, 1889) was an English physicist, born in Sale, Cheshire. ... In electronics, and in physics more broadly, Joule heating refers to the increase in temperature of a conductor as a result of resistance to an electrical current flowing through it. ... Lightning strikes during a night-time thunderstorm. ... In physics, mechanical work is the amount of energy transferred by a force. ...

Contents

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: In physics, force is anything that can cause a massive body to accelerate. ... The newton (symbol: N) is the SI derived unit of force, named after Sir Isaac Newton in recognition of his work on classical mechanics. ... ‹ The template below (Unit of length) is being considered for deletion. ... Torque applied via an adjustable end wrench Relationship between force, torque, and momentum vectors in a rotating system In physics, torque (or often called a moment) can informally be thought of as rotational force or angular force which causes a change in rotational motion. ...

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.

Electric charge is a fundamental conserved property of some subatomic particles, which determines their electromagnetic interaction. ... The coulomb (symbol: C) is the SI unit of electric charge. ... Josephson junction array chip developed by NIST as a standard volt. ... For other uses, see Watt (disambiguation). ... Look up second in Wiktionary, the free dictionary. ... The kilowatt-hour (symbol: kW·h) is a unit for measuring energy. ...

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. James Joule - English physicist James Prescott Joule, FRS (December 24, 1818 – October 11, 1889) was an English physicist, born in Sale, Cheshire. ...


Conversions

1 joule is exactly 107 ergs. Conversion of units refers to conversion factors between different units of measurement for the same quantity. ... An erg is the unit of energy and mechanical work in the centimetre-gram-second (CGS) system of units, symbol erg. Its name is derived from the Greek word meaning work. The erg is a small unit, equal to a force of one dyne exerted for a distance of one...


1 joule is approximately equal to:

Units defined in terms of the joule include: The electronvolt (symbol eV) is a unit of energy. ... A calorie is a unit of measurement for energy. ... The British thermal unit (BTU or Btu) is a unit of energy used in the Power, Steam Generation and Heating and Air Conditioning industry globally. ... The foot-pound force (symbol: ft·lbf) is an English unit of work or energy from the English Engineering System. ... The poundal is a non-SI unit of force. ... The kilowatt-hour (symbol: kW·h) is a unit for measuring energy. ... The watt-hour (symbol W·h) is a unit of energy. ... Standard atmosphere (symbol: atm) is a unit of pressure. ...

  • 1 thermochemical calorie = 4.184 J
  • 1 International Table calorie = 4.1868 J
  • 1 watt-hour = 3600 J
  • 1 kilowatt-hour = 3.6 ×106 J

1 joule in everyday life is approximately: A calorie is a unit of measurement for energy. ... The watt-hour (symbol W·h) is a unit of energy. ... The kilowatt-hour (symbol: kW·h) is a unit for measuring energy. ...

  • the energy required to lift a small apple (102 g) 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 air by 1 degree Celsius.
  • one hundredth of the energy a person can get by drinking a single 5 mm diameter droplet of beer.

BIC pen cap, about 1 gram. ... The metre, or meter (symbol: m) is the SI base unit of length. ... Gravity is a force of attraction that acts between bodies that have mass. ... For other uses, see Heat (disambiguation) In physics, heat, symbolized by Q, is energy transferred from one body or system to another as a result of a difference in temperature. ... Layers of Atmosphere—not to scale (NOAA) [1] Earths atmosphere is a layer of gases surrounding the planet Earth and retained by the Earths gravity. ... For other uses, see Beer (disambiguation). ...

SI multiples

Multiple Name Symbol Multiple Name Symbol
100 joule J      
101 decajoule daJ 10–1 decijoule dJ
102 hectojoule hJ 10–2 centijoule cJ
103 kilojoule kJ 10–3 millijoule mJ
106 megajoule MJ 10–6 microjoule µJ
109 gigajoule GJ 10–9 nanojoule nJ
1012 terajoule TJ 10–12 picojoule pJ
1015 petajoule PJ 10–15 femtojoule fJ
1018 exajoule EJ 10–18 attojoule aJ
1021 zettajoule ZJ 10–21 zeptojoule zJ
1024 yottajoule YJ 10–24 yoctojoule yJ
This SI unit is named after James Prescott Joule. As for all SI units whose names are derived from the proper name of a person, the first letter of its symbol is uppercase (J). But when an SI unit is spelled out, it should always be written in lowercase (joule), unless it begins a sentence or is the name "degree Celsius".
— Based on The International System of Units, section 5.2.

Look up si, Si, SI in Wiktionary, the free dictionary. ... James Joule - English physicist James Prescott Joule, FRS (December 24, 1818 – October 11, 1889) was an English physicist, born in Sale, Cheshire. ... Majuscules or capital letters (in the Roman alphabet: A, B, C, ...) are one type of case in a writing system. ... Minuscule, or lower case, is the smaller form (case) of letters (in the Roman alphabet: a, b, c, ...). Originally alphabets were written entirely in majuscule (capital) letters which were spaced between well-defined upper and lower bounds. ... Celsius is, or relates to, the Celsius temperature scale (previously known as the centigrade scale). ...

See also

Conversion of units refers to conversion factors between different units of measurement for the same quantity. ... An SI prefix (also known as a metric prefix) is a name or associated symbol that precedes a unit of measure (or its symbol) to form a decimal multiple or submultiple. ... An order of magnitude is the class of scale or magnitude of any amount, where each class contains values of a fixed ratio to the class preceding it. ... This article or section does not cite any references or sources. ... The electronvolt (symbol eV) is a unit of energy. ... The watt-hour (symbol W·h) is a unit of energy. ... Fluence is defined as energy per unit area . ... Foe is a unit of energy equal to 1044 joules. ...

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.

A calorie is a unit of measurement for energy. ...

External links

  • Unit conversion from joule

  Results from FactBites:
 
Joule - Wikipedia, the free encyclopedia (443 words)
The joule (symbol: J) is the SI unit of energy, or work with base units of kg·m²/s² (N·m).
The joule is a derived unit defined as the work done or energy 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 or newton-metre with the symbol N·m.
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.
James Prescott Joule - Wikipedia, the free encyclopedia (2345 words)
The SI unit of work, the joule, is named after him, and is pronounced to rhyme with "tool." He worked with Lord Kelvin to develop the absolute scale of temperature, made observations on magnetostriction, and found the relationship between the flow of current through a resistance and the heat dissipated, now called Joule's law.
Joule was influenced by the thinking of Franz Aepinus and tried to explain the phenomena of electricity and magnetism in terms of atoms surrounded by a "calorific ether in a state of vibration".
Joule was a pupil of Dalton and it is no surprise that he had learned a firm belief in the atomic theory, even though there were many scientists of his time who were still skeptical.
  More results at FactBites »

 
 

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