3.4.10

Static Electricity

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Static Electricity

Have you ever had a shock from a trampoline or an escalator? Have you ever seen lightning? These are all examples of static electricity.

Jumping charges

Jumping charges

  • Static electricity is caused by negatively charged electrons jumping from one material to another.
  • When you rub two insulating materials together, one substance will lose electrons the other will gain electrons.
  • If you rub a cloth on a plastic rod the cloth will rub off electrons. If this happens:
    • The cloth will gain electrons and so become negatively charged.
    • The plastic rod will lose electrons and so become positively charged.
  • This is why a balloon will stick to the wall after you have rubbed it on your head.
Non-contact force

Non-contact force

  • Static electricity is a non-contact force.
  • It is non-contact because the charged objects do not have to touch to attract or repel.
Van de Graaff Generator

Van de Graaff Generator

  • The Van de Graaff generator produces static electricity.
  • The belt of the generator rubs off charges and so the dome becomes charged.
  • These charges jump from the dome to the generator's ball if it is placed near it.
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