Potential energy for a system of electrically charged particles, qi
can be defined as
where = 8.854 x 10 C/N m is the permittivity of free space, q' is a test charge, qi is a charged particle, and ri is the distance betwen the test charge and the charges qi.
Potential difference (or simply 'potential', sometimes referred to as 'voltage') is related to electrical potential energy, U, by:
Return to:Ohm's Law