Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. In physics, the electron volt (symbol eV; also written electronvolt) is a unit of energy equal to approximately 1.602x10–19 J. By definition, it is equal to the amount of kinetic energy gained by a single unbound electron when it accelerates through an electric potential difference of one volt. Thus it is 1 volt (1 joule per coulomb) multiplied by the electron charge (1 e, or 1.60217653(14)x10–19 C). Therefore, one electron volt is equal to 1.60217653(14)x10–19 J. Historically, the electron volt was devised as a standard unit of measure through its usefulness in electrostatic particle accelerator sciences because a particle with charge q has an energy E=qV after passing through the potential V; if q is quoted in integer units of the elementary charge and the terminal bias in volts, one gets an energy in eV.

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