| 7 | 7 | Batteries have two electrical terminals and chemicals between them. The terminals and chemicals are chosen so that they can react chemically, for the reaction to work, one terminal needs to lose electrons and the other needs to gain them. So when electrons can move from one terminal to the other, the chemical reaction proceeds. Normally, the battery terminals are separated by air which resists the flow of electrons, but if the terminals are connected together with a wire or other material that allows electrons to flow, the reaction proceeds as long as electrons flow from one terminal to the other. |
