Joule (unit) | joules unit
FromKnowinoThejoule(symbolJ)istheSIunitofenergy[1]—ameasureofthecapacitytodowork[2]orgenerateheat[3].Onejouleequalstheworkdone(orenergyexpended)byaforceofonenewton[4](N)actingoveradistanceofonemeter(m).Onenewtonequalsaforcethatproducesanaccelerationofonemeterpersecond(s)persecondonaonekilogram(kg)mass.Therefore,onejouleequalsonenewton•meter.Expressedinequations:ThemechanicalquantitiesinvolvedhavetheSIunits:ItfollowsthatJ(joule)isexpressedinSIbasicunitsas:.Jouleisvariouslypronouncedjool(rhyme...
From Knowino
The joule (symbol J) is the SI unit of energy[1]—a measure of the capacity to do work[2] or generate heat[3]. One joule equals the work done (or energy expended) by a force of one newton[4] (N) acting over a distance of one meter (m). One newton equals a force that produces an acceleration of one meter per second (s) per second on a one kilogram (kg) mass. Therefore, one joule equals one newton•meter.
Expressed in equations:
The mechanical quantities involved have the SI units:
It follows that J (joule) is expressed in SI basic units as:
.
Joule is variously pronounced jool (rhymes with jewel) or joul (rhymes with jowl).
One may also use electric units to define the joule. One joule measures the energy released by a electric charge of one coulomb[5] dropping one volt[6] in absolute value of electrical potential. Th...