Joule J
About the Joule
The joule is the work done when a force of one newton moves its point of application one metre. It is named after James Prescott Joule, who measured the mechanical equivalent of heat. It replaced the calorie in science; one thermochemical calorie is exactly 4.184 J and one kilowatt-hour is exactly 3.6 million joules.
Related Units
Kilowatt-hour
kWh1 kWh = 3,600,000 J (exact)
A kilowatt-hour is the energy delivered by one kilowatt of power for one hour, exactly 3.6 megajoules. It is the unit...
British thermal unit
BTU≈ 1055.056 J (International Table)
The British thermal unit is roughly the heat needed to raise one pound of water by one degree Fahrenheit, about 1055.06...
Erg
erg10⁻⁷ J (exact)
The erg is one dyne acting through one centimetre, exactly 10⁻⁷ joules. Its name comes from the Greek ergon, work...
Electronvolt
eV1.602176634 × 10⁻¹⁹ J (exact)
An electronvolt is the energy gained by one electron accelerated through a potential difference of one volt. Since the...