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Read the following text and answer the question.
In this science experiment, we will make a miniature bolt of lightning using a balloon, piece of wool and some metal. We will explore static electricity and what causes lightning. We will leam about electrons, atoms, positive and negative charges.
What to do:
1. Blow up the balloons.
2. Turn off the lights in a room at night and get it as dark as possible.
3. Rub the balloon rapidly against a piece of wool or wool sweater several times. This will give the balloon a negative charge as electrons jump from the wool to the balloon. When rubbing the wool against the balloon we are creating static electricity and saving it up in the balloon.
4. Move the balloon close to something metal like a filing cabinet or a doorknob.
5. Watch for a flash or spark that jumps from the balloon to the metal object just like lighting.
Please note: The humidity in the air can affect static electricity. If the air is damp, such as during the winter, then this experiment may not work.
Adopted from: http://weirdsciencekids.com/MakeLightning.html (April 12, 2012)
Why is the experiment carried out?
To explore the advantages of static electricity.
To study static electricity and the cause of lightning.
To explain how a bolt of lightning is created.
To learn about the relationship between electrons and positive and negative charges.
E. To explain where and when we can see lightning.
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R. Rani
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