- a unit of energy, equal to the energy acquired by an electron accelerating through a potential difference of one volt and equivalent to 1.602 × 10−19 joules. Abbreviation: eV, ev
- A unit of energy equal to the energy acquired by an electron falling through a potential difference of one volt, approximately 1.602 X 10-19 joule.
- A unit used to measure the energy of subatomic particles. One electron volt is defined as the energy needed to move an electron (which has an electric charge equal to -1) across an electric potential of one volt.