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Unit of energy in the SI system
This article is about the unit of energy or work. For other uses, see Joule (disambiguation).
joule
Unit system
SI
Unit of
energy
Symbol
J
Named after
James Prescott Joule
Conversions
1 J in ...
... is equal to ...
SI base units
kg⋅m2⋅s−2
CGS units
1×107 erg
watt-seconds
1 W⋅s
kilowatt-hours
≈2.78×10−7 kW⋅h
kilocalories (thermochemical)
2.390×10−4 kcalth
BTUs
9.48×10−4 BTU
electronvolts
≈6.24×1018 eV
The joule (pronounced /ˈdʒuːl/, JOOL or /ˈdʒaʊl/JOWL; symbol: J) is the unit of energy in the International System of Units (SI).[1] It is equal to the amount of work done when a force of one newton displaces a mass through a distance of one metre in the direction of that force. 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).[2][3][4]
^International Bureau of Weights and Measures (2006), The International System of Units (SI)(PDF) (8th ed.), p. 120, ISBN 92-822-2213-6, archived (PDF) from the original on 2021-06-04, retrieved 2021-12-16
^American Heritage Dictionary of the English Language, Online Edition (2009). Houghton Mifflin Co., hosted by Yahoo! Education.
^The American Heritage Dictionary, Second College Edition (1985). Boston: Houghton Mifflin Co., p. 691.
^McGraw-Hill Dictionary of Physics, Fifth Edition (1997). McGraw-Hill, Inc., p. 224.
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