The superposition principle holds for electric potential energy; the potential energy of a system of multiple charges is the sum of the potential energies of the individual pairs We can define an electric potential energy, which between point charges is U ( r ) = k e q Q r , with the zero reference taken to be at infinity

Therefore, the electric field and electric force are conservative Electric potential is potential energy per unit charge

electric potential — potential energy per unit charge. voltage — change in potential energy of a charge moved from one point to another, divided by the charge; units of potential difference are joules per coulomb, known as volt. electron-volt — energy given to a fundamental charge accelerated through a potential difference of one volt. electric potential energy — potential energy stored in a system of charged objects due to the charges.