Another fun activity from the Exploratorium Teacher Institute Project.
Most batteries use two different materials and an electrolyte solution to create an imbalance of charge and thus a voltage. When the terminals of the battery are connected with a wire, this voltage produces a current.
In this Snack, the thin film of sweat on your hands acts like an electrolyte solution and reacts with the copper and aluminum plates. When you touch the copper plate, a reaction happens that uses electrons. When you touch the aluminum plate, a reaction happens that releases electrons.
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