Static Electricity

Static Electricity

1. Caused By Friction

   • Two insulating materials rubbed together, electrons go from on to the other.
   • This leaves positive static charge on one due to lack of electrons.
   • Leaves negative static charge on one due to excess of electrons.
   • Electrically charged objects attract small neutral objects placed near them.
   • E.g. Polythene and acetate rods being rubbed with cloth duster.

2. Only Electrons Move

   • Positive do NOT move. Postive charge is caused by electrons moving away.
   • Electrons can suddenly move creating sparks or shocks which can be dangerous..
   • Charged conductors can be safely disconnected by attaching to earth.
   • Electrons flow down the strap if charge is negative and visa versa.

3. Opposites Attract, Like repel

   • Forces get weaker furthur away you go
   • Atoms or molecules that become charged are known as ions.

4. Nuisance

   • Attracting Dust
     • Dust Particles are charged
     • Attracted to anything opposite charged
   • Clothing Clings & Crackles
     • Synthetic clothes dragged over each other
     • Electrons scraped off leaving static charges
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