I have always wondered if the experiment you always see on T.V. is actually possible and after further research, I realized that it is possible to charge your phone with a potato. The reason this is able to happen is because the potato acts like an electrolyte. When a galvanized nail and copper are inserted into the potato, they act as electrodes. Atoms from the galvanized nail- which is made of zinc- dissolves into the potato as a positively charged ion. This leaves two negatively charged atoms behind. These electrons then pass through the wire connecting the two electrodes and his flow of electrons is what creates electrical current which charges your phone.