The amount of energy a thing has can be given a number. As in other kinds of measurements, there are measurement units. The units of measurement for measuring energy are used to make the numbers meaningful. The SI unit for both energy and work is the joule (J). It is named after James Prescott Joule. 1 joule is equal to 1 newton-metre. In terms of SI base units, 1 J is equal to 1 kg m2 s−2. It is most often used in science, though particle physics often uses the electronvolt. The measurement for electricity most often uses the kilowatt-hour (kW·h). One kW·h is equivalent to 3,600,000 J (3600 kJ or 3.6 MJ). Related pages
References
- ↑ Woolley, Steve (2011). Edexcel IGCSE Physics Revision Guide. Pearson Education. p. 49. ISBN 9780435046736.
on the screen of a cathode-ray tube. joule . , n. A derived unit of energy of work in the International System of Units; it is the work done when the point
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