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Potato Clock - Make a Potato Battery to Power an LED Clock

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Materials for a Potato Clock
Potatoes aren't the only foods that work to power a clock.

Potatoes aren't the only foods that work to power a clock.

Justin Lightley, Getty Images
You may have the supplies for the potato clock lying around the house already. Otherwise, you can find the materials for a potato clock in any hardware store. There are also pre-made kits you can purchase that contain everything you need except the potatoes. You will need:
  • 2 potatoes (or cut one potato in half)
  • 2 short lengths of copper wire
  • 2 galvanized nails (not all nails are galvanized or zinc-coated)
  • 3 alligator clip wire units (alligator clips connected to each other with wire)
  • 1 low-voltage LED clock (type that takes a 1-2 volt button battery)

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