Electronvolt

In pheesics, the electron volt (seembol eV; an aa written electronvolt) is a unit o energy equal tae approximately 6981160000000000000♠1.6×10⁻¹⁹ joule (seembol J). By defineetion, it is the amoont o energy gained (or lost) bi the charge o a single electron moved across an electric potential difference o ane volt. Thus it is 1 volt (1 joule per coulomb, 7000100000000000000♠1 J/C) multiplied bi the elementary charge (e, or 6981160217656499999♠1.602176565(35)×10⁻¹⁹ C). Tharefore, one electron volt is equal tae 6981160217656499999♠1.602176565(35)×10⁻¹⁹ J. Historically, the electron volt wis devised as a staundart unit o measur through its uisefuness in electrostatic pairticle accelerator sciences acause a pairticle wi charge q haes an energy E = qV efter passin through the potential V; if q is quotit in integer units o the elementary charge an the terminal bias in volts, ane gets an energy in eV.