Basically, a potato clock is an electrochemical battery – this is where chemical energy is turned into electrical energy by the movement of electrons, which carry electrical charge. This electrical energy can then power the clock.
The zinc nail that is inserted into the potato releases zinc ions into the potato. The copper wire that is inserted into the potato releases copper ions (electrically-charged atoms) into the potato. These two ions like to react with each other, but the potato is keeping them apart. The electrons then have to travel through the copper wire in order to react, as it is the path of least resistance.
This movement of electrons then powers the clock.
I hope this helps! Maybe Aimee might be able to help a bit more – she loves metals!
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