The numerical value of ionization energy in eV equals the ionization potential in volts. Does the equality hold if these quantities are measured in some other units?
The electron volt is the amount of energy given to an electron in order to move it through the electric potential difference of one volt.1 eV = 1.6 × 10–19  JThe numerical value of ionisation energy in eV is equal to the ionisation potential in volts. The equality does not hold if these quantities are measured in some other units.