Joule
Unit of energy in the SI system / From Wikipedia, the free encyclopedia
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The joule (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 1 newton displaces a mass through a distance of 1 metre in the direction of the force applied. 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]
Unit of energy in the SI system
| 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 |