Started by a School Science Teacher
tree frog

Lemon Clock

Power a digital clock using fruit.
Manufacturer: 4M


What? No batteries! Be a scientist and discover how to power this digital clock using potatoes. Experiment to find out what substances will power the clock.

Includes digital clock with wires, copper and zinc electrodes, and detailed instructions.

How Does it work?

The copper plates act like the positive electrodes of a battery. They are less reactive than zinc. When the copper and zinc plates are inserted into the lemon, a chemical reaction occurs. Electrons move from the zinc plate to the copper plate creating a small electric current.

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