Discover the science behind batteries!
No batteries or power points needed - just a lemon!
How cool is that? This is how:
How does it work? Copper plates act like the positive electrodes of a battery because they are plated with a metal which is less reactive than zinc. When the copper plates and zinc plates are inserted into the lemon, a chemical reaction takes place. Electrons (extremely small particles with negative charge) move from the zinc plates to the copper plates to form a current, thus activating the LCD watch.
The lemon juice helps to conduct electricity. You can replace the lemon with a potato, a grapefruit or use soft drinks and see what effect they have.
- Put some zing in the old tick tock with a lemon powered clock!
- Suitable for ages 5+
- An initiative of the Committee for the use of Citrus in Science