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Joule
Joule
Standard:SI derived unit
Quantity:Energy
Symbol:J
Named after:James Prescott Joule
Expressed in:1 J =
SI base units1 kg·m2/s2
CGS units1×107 erg
kilowatt hours2.78×10−7 kW·h
kilocalories2.39×10−4 kcal
BTUs9.48×10−4 BTU

A joule (/ˈl/ or sometimes /ˈl/) is a unit in the SI system. It measures energy; usually in scientific or electrical appliances . It is named after James Prescott Joule.

A joule refers to the amount of energy transferred to an object when a force of 1 newton is applied on it over a distance of 1 metre (1J = 1N × 1m). It is related to the watt (a unit of power): one watt equals one joule per second.

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