How to Make a Battery From Fruit Juice

Written by ehow hobbies, games & toys editor
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Fruit juice contains acid, which conducts electricity. A fruit juice battery converts chemical energy into electrical energy. To make a fruit juice battery, connect wires between coins inserted in fruit and a voltmeter. Your electric fruit salad may include a lemon, lime, orange, grapefruit, apple and banana--or any fruits you choose. Record on paper the results of turning fruit into mini-power plants.

Skill level:
Moderately Challenging

Things you need

  • Pieces of fruit
  • Nickels and pennies
  • Sand paper
  • Alligator clip wires
  • Voltmeter
  • Paper and pencil

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  1. 1

    Roll the citrus fruits on the counter to loosen the juices inside. Do not roll the apple and banana.

  2. 2

    Cut two slits about a fingerprint apart in each piece of fruit.

  3. 3

    Rub the pennies and nickels with sandpaper.

  4. 4

    Insert a nickel in one slit in each piece of fruit and a penny in the other.

  5. 5

    Connect a pair of alligator clips, located on each end of a connector wire, to a nickel inserted in a piece of fruit, and to one of the leads on the voltmeter. Test the fruits one at a time.

  6. 6

    Repeat the step by connecting a pair of alligator clips to a penny inserted in the same piece of fruit to the other lead on the voltmeter.

  7. 7

    Record and compare voltmeter readings, rating the fruits from the most powerful to the least.

Tips and warnings

  • Try the experiment with vegetables.
  • Use a speaker from a transistor radio if you don't have a voltmeter. It will click when it registers electric current.
  • Do not eat the fruits used in the experiment.

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