1. The problem statement, all variables and given/known data The engine delivers 12 kW. Per second it can shift the m = 800 kg car over a vertical distance of 1.5 m. Find the current delivered by the batteries. 2. Relevant equations P = U * I I = P/U = 12 000 W / 168 V = 71.4 A 3. The attempt at a solution My Problem is: I don't really know how to calculate V... I know that V = J/C and Js = 12 000, but I don't know how to find out the Coulomb. Can please someone help?