electron voltelectron volt
a unit of energy equal to that attained by an electron falling unimpeded through a potential difference of one volt; 1.602 × 10 joule: abbrev. eV
often written elec′tron·volt· or elec′tron-volt·
A unit of energy equal to the energy acquired by an electron falling through a potential difference of one volt, approximately 1.602 × 10−19 joules.