Here's a simple demonstration of how many everyday foods and drinks have the capacity to conduct electricity, to the point where they can essentially be used to power devices! For each one that works, it's basically forming an electrochemical cell that converts the chemical energy stored in the embedded zinc and copper strips into electrical energy. The cell allows ions to move between the zinc and copper strips, creating an electric current.
Note that the metal strips are never physically touching each other in any of the experiments - I tried to make them at least 1cm apart in each demonstration.
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