Electrochemical cells In principle, the change of chemical energy into electrical energy. These electrodes are copper and zinc plates immersed in dilute sulfuric compounds. The two electrodes react with a solution and then dissociate. The zinc will slow electrons than copper. Cause electrons from zinc to copper. A zinc electrode and a negative voltage is low. The copper electrode is positive and high voltage. So to make the electrons flow from zinc to copper. Therefore the electrical current