1. The problem statement, all variables and given/known data What is the potential energy of an electron in a parallel plate capacitor if kept on the negative plate before being released? 2. Relevant equations 1/2mv^2 = qV = PE Capacitor Energy = 1/2QV 3. The attempt at a solution 1/2mv^2 = qV = PE However if I'm not mistaken there's also 1/2QV equation that states the energy stored in a capacitor? Which one then should I choose for this electron problem? The normal qV or the 1/2qV?