Static Electricity

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  • Created by: Qiao-Chu
  • Created on: 07-04-13 21:19
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  • Static Electricity
    • Charges that are not free to move i.e. insulating materials
      • Causes charge to build up in one place and often ends with a spark or shock when they do finally move
    • When insulating materials rubbed against each other, negatively charged electrons are scraped off one and dumped on the other
      • This leads to a positive static charge on one and a negative static charge on the other
    • Which way electrons are transferred depends on materials involved
      • Electronically charged objects attract small objects near them
    • Polyethene rod and duster: electrons move from duster to rod
    • Acetate rod and duster: electrons move from rod to duster
    • Both positive and negative charges are produced by movement of electrons
      • BUT POSITIVE CHARGES DO NOT MOVE
      • Positive charge is caused by loss of electrons
    • Two electrically charged objects exert a force on each other
      • Like charges repel, opposite charges attract
        • Forces weaker the further apart
    • Electrical charge can move easily through materials called conductors
      • Metals are good conductors

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