Lemon battery
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A lemon battery is a battery used in experiments proposed in many science textbooks around the world.Lemon Battery</ref> It is made by inserting two different metallic objects, for example a galvanized nail and a copper coin, into an ion bridge (for example a lemon, a potato or paper soaked in salt water or acid). The copper coin serves as the positive electrode or cathode and the galvanized nail as the electron-producing negative electrode or anode. These two objects work as electrodes, causing an electrochemical reaction which generates a small potential difference. In 1800, Alessandro Volta discovered that an acidic mixture of lemon juice served as an effective conductor of electrons between two dissimilar metals. While the grade school lemon battery itself was not created by him, he is the closest known source to that discovery. Without his knowledge, people may not have had the incentive to attempt the actual lemon battery.
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