Text: The basic unit of energy used in high energy physics. It is the energy gained by one electron when it moves through a potential difference of one volt. By definition an eV is equivalent to 1.6 x 10-19 joules. This is a very small amount of energy and the more commonly used multiples are MeV (million eV), GeV (billion eV or giga-electronvolt) and TeV (trillion eV). MeV Mega Electron Volt: Energy equal to that acquired by a particle with one electronic charge in passing through a potential difference of one million volts.

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