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The joule ( /ˈdʒuːl/ or /ˈdʒaʊl/); symbol J) is a derived unit of energy or work in the International System of Units. It is equal to the energy expended (or work done) in applying a force of one newton through a distance of one metre (1 newton metre or N·m), or in passing an electric current of one ampere through a resistance of one ohm for one second. It is named after the English physicist James Prescott Joule (1818–1889).
In terms firstly of base SI units and then in terms of other SI units:
where N is the newton, m is the metre, kg is the kilogram, s is the second, Pa is the pascal, and W is the watt.
One joule can also be defined as: