Moving the positive charge from the positive to negative terminal would be with the electric field, so the charge would experience a decrease in potential energy as it moved through an external circuit. (You’ve noticed that we’re only talking about positive test charges here in order to determine which end of the battery is high and which end is low.) This is a really neat experiment on how to make your own solar battery. If you don’t have time or copper flashing for this one, you can just skip doing it but be sure to watch it just for fun…
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