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A lemon battery is a device used in experiments proposed in many science textbooks around the world. It is made by inserting two different metallic objects, for example a galvanized nail and a copper coin, into a lemon. The copper coin serves as the positive electrode or cathode and the galvanized nail as the negative electrode or anode. These two objects work as electrodes, causing an electrochemical reaction which generates a small potential difference. (Source: Wikipedia) |
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