Static Electricity
- 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
- Like charges repel, opposite charges attract
- Electrical charge can move easily through materials called conductors
- Metals are good conductors
- Charges that are not free to move i.e. insulating materials
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