What is Electronvolt?
{{cleanup|date=November 2024}} The '''electron-volt''' or '''electron volt''', symbol '''eV''', is used to measure [[Energy#Scientific energy|energy]]. It is defined as the amount of energy an [[electron]] gains after being accelerated by 1 [[volt]] of electricity. Joule is used often for energy [[measurement]], while sometimes useful to use electron-volts for a tiny amount of energy, or ''quantum'', such as that carried by a single [[subatomic particle]]. To convert joules into electron-volts, divide joules by the charge of an [[electron]], which is about 1.602{{e|−19}} [[coulomb]]. E.g. 5 J = 5/1.602{{e|−19}} <br /> 5 J = 3.121{{e|+19}} eV. The electronvolt is often used in [[Atomic physics|atomic]], [[Nuclear physics|nuclear]] and [[particle physics]]. For example, the energy of [[photon]]s can be measured by the [[voltage]] necessary to overcome their [[photoelectric effect]]. == Other websites == * [http://www.unitconversion.org/energy/joules-to-electron-volts-conversion.html Conversion Tool] * [http://en.citizendium.org/wiki/Electronvolt Electronvolt] Citizendium {{SI units}} {{physics-stub}} [[Category:Units of energy]] [[Category:Physics]]