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Longman Dictionary of Contemporary English
▪ For them, energy comes in joules, and force in newtons, but whatever happened to ergs and dynes?
▪ The energy applied in each pulse was 25-30 joules.
The Collaborative International Dictionary

joule \joule\ (j[=oo]l), n. [From the distinguished English physicist, James Prescott Joule (1818-1889).] (Physics.) A unit of work which is equal to 10^ 7 ergs (the unit of work in the C. G. S. system of units), and is equivalent to one watt-second, the energy expended in one second by an electric current of one ampere in a resistance of one ohm; also called the absolute joule. It is abbreviated J or j. The international joule is slightly larger, being 1.000167 times the absolute joule. The absolute joule is approximately equal to 0.737562 foot pounds, 0.239006 gram-calories (small calories), and 3.72506 x 10^ -7 horsepower-hours, and 0.000948451 B.t.u.

Joule's equivalent. See under Equivalent, n.

Douglas Harper's Etymology Dictionary

unit of electrical energy, 1882, coined in recognition of British physicist James P. Joule (1818-1889).


n. In the International System of Units, the derived unit of energy, work and heat; the work required to exert a force of one newton for a distance of one metre. Also equal to the energy of one watt of power for a duration of one second. Symbol: J

  1. n. a unit of electrical energy equal to the work done when a current of one ampere passes through a resistance of one ohm for one second [syn: J, watt second]

  2. English physicist who established the mechanical theory of heat and discovered the first law of thermodynamics (1818-1889) [syn: James Prescott Joule]


The joule , symbol J, is a derived unit of energy in the International System of Units. It is equal to the energy transferred (or work done) to an object when a force of one newton acts on that object in the direction of its motion through a distance of one metre (1 newton metre or N·m). It is also the energy dissipated as heat when an electric current of one ampere passes through a resistance of one ohm for one second. It is named after the English physicist James Prescott Joule (1818–1889).

In terms firstly of base SI units and then in terms of other 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 also be defined as:

  • The work required to move an electric charge of one coulomb through an electrical potential difference of one volt, or one '"coulomb volt" (C·V). This relationship can be used to define the volt.
  • The work required to produce one watt of power for one second, or one "watt second" (W·s) (compare kilowatt hour - 3.6 megajoules). This relationship can be used to define the watt.
Joule (programming language)

Joule is a concurrent dataflow programming language, designed for building distributed applications. It is so concurrent that the order of statements within a block is irrelevant to the operation of the block. Statements are executed whenever possible, based on their inputs. Everything in Joule happens by sending messages. There is no control flow. Instead, the programmer describes the flow of data, making it a dataflow programming language.

It is considered the precursor to the E programming language.

Joule (crater)

Joule is a lunar impact crater that lies on the far side of the Moon. It is located to the north-northeast of the walled plain Mach. To the northwest of Joule is the crater Blazhko.

This is a worn and eroded crater formation. A pair of smaller craters lies along the northeastern rim, and a crater is intruding into the northwest rim. To the south is an outward projection that has the appearance of a crater partly overlain by Joule. The remainder of the rim and inner wall is somewhat irregular. The interior floor is more level than the terrain surrounding the crater, but is marked by some small craterlets. At the midpoint of the interior floor is a central peak.

Joule T, located less than a crater diameter to the west of Joule, lies at the center of a ray system. These rays primarily project to the south of the crater, with the most prominent ray crossing the crater Harvey to the south. Only faint traces of this ray system actually cross into Joule, and are generally restricted to the western rim, inner sides and floor.

Joule (disambiguation)

The joule is the derived unit of energy in the International System of Units.

Joule may also refer to:

  • James Prescott Joule (1818–1889), English physicist for which the joule is named
Joule (surname)

Joule is a surname. Notable people with the surname include:

  • James Prescott Joule (1818–1889), physicist and brewer
  • John Joule, chemist
  • Reggie Joule (born 1952), politician

Fictional characters:

  • Yzak Joule, a character in the anime series Mobile Suit Gundam SEED

Usage examples of "joule".

GeV, requires an energy input of about 7,000 joules and a persistent circulating current of 250 amps, if a 20 km deployed superconducting wire coil is used.

When the discharge setting is activated, a stream of particles are released through that lens, a power of about two thousand joules to a three-second burst.

And when one collapses, all those Joules come out at once, one way or another.

They had discovered the X ray, the cathode ray, the electron, and radioactivity, invented the ohm, the watt, the Kelvin, the joule, the amp, and the little erg.