So I know the law of energy conservation applies when dealing with electric force, but I don't quite understand what electric PE is. From my understanding of energy conservation, Electric PE (initial) + KE (initial) = Electric PE (final) + KE (final) (ignoring gravity) and thus, KE (final) - KE (initial) = -(Electric PE (final) - Electric PE (initial)) For instance, if a negative test charge was to be released from rest and started traveling toward a positive source charge, and I were to calculate the velocity of the test charge as it reaches the source charge, Electric PE (final) would be close to infinity, thus velocity(final) would be infinity as well? However, from the homework problems I'm doing, they're only using Electric PE (initial) and setting that equal to KE (final), which I don't understand -- how come they're not accounting for Electric PE (final)? Thank you so much guys! This forum rocks!