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An electrochemical cell uses chemical reactions to generate electrical energy. A lemon battery is similar to the first battery invented in 1800 and uses lemon juice as an electrolyte between zinc and copper electrodes. Experiments show that the lemon battery generates electricity through oxidation-reduction reactions, with the voltage decreasing predictably based on factors like the addition of zinc sulfate or changes in acidity. The energy comes from the chemical change that occurs when zinc dissolves in the acid electrolyte.
