Re: "Two capacitors" Fred: Original voltage = V Original energy = E1= 1/2[CV^2] Final energy = E2 = 1/2[C(V/2)^2] + 1/2[C(V/2)^2] = 1/2[CV^2/2] E2 = 1/2 E1 CHARGE (CV) is conserved, ENERGY (1/2CV^2) is not! Ed Phillips