Energy of Electrons

The electron volt is a unit of energy equal to the work done when one electron is moved through a potential difference of 1 volt

1 eV   =   1.6 × 10^-19 joules

Since potential difference is work done per unit charge W = QV and the charge of an electron means Q=e and the potential difference V=1 volt.When an electron moves through a potential difference of 2000V the work done is equal to 2000eV.