1. Science 9 Electricity Static Electric Charge

2. Static Electric Charge (9-2) Static electric charge- Static electric charge- A charge on a substance that stays in the same place A charge on a substance that stays in the same place

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4. Examples of Static Charge Lightning- Lightning-(9-10) http://www.youtube.com/watch?v=gKPwkau0Dh0 &feature=related http://www.youtube.com/watch?v=gKPwkau0Dh0 &feature=related http://www.youtube.com/watch?v=HLcFHo2HR7I &feature=related http://www.youtube.com/watch?v=HLcFHo2HR7I &feature=related Static cling- Static cling-

5. Examples of Static Charge Static shock- Static shock-

6. Producing Static Electricity Charge by Friction- (9-3) Charge by Friction- (9-3) Electric charge is transferred by rubbing object together Electric charge is transferred by rubbing object together

7. Producing Static Electricity We know which object will cause which charge when caused by friction using the Electrostatic Series (9-3) (Items above become negatives) Rubber Rubber Ebonite Ebonite Polyethylene Polyethylene cotton cotton silk silk wool wool glass glass acetate acetate fur/hair fur/hair (Items below become positives)

8. Producing Static Electricity Charge by conduction (contact)- (9-5) Charge by conduction (contact)- (9-5) Charge is transferred by touching a charged object to an uncharged object Charge is transferred by touching a charged object to an uncharged object http://www.shep.net/resources/curricular/physi cs/P30/Unit2/electroscope.swf http://www.shep.net/resources/curricular/physi cs/P30/Unit2/electroscope.swf

9. Producing Static Electricity Charge by induction- (9-8) Charge by induction- (9-8) Neutral object becomes charged when a charged object is brought near it. Neutral object becomes charged when a charged object is brought near it. Induced charge can become more permanent if a ground wire is attached to it. Induced charge can become more permanent if a ground wire is attached to it. http://www.shep.net/resources/curricular/physi cs/P30/Unit2/electroscope.swf http://www.shep.net/resources/curricular/physi cs/P30/Unit2/electroscope.swf

10. Laws of Electric Charge (9-2) Unlike charges attract one another Unlike charges attract one another Like charges repel one another Like charges repel one another

11. Removing Static Electricity (9-7) Discharge (neutralize)- Discharge (neutralize)- When excess electric charge is removed from an object. When excess electric charge is removed from an object. Discharge can be quick and explosive (lightning) Discharge can be quick and explosive (lightning) Discharge can be unnoticed (fabric softener sheet) Discharge can be unnoticed (fabric softener sheet) http://www.youtube.com/watch?v=R7cgazVkhTk&fe ature=related http://www.youtube.com/watch?v=R7cgazVkhTk&fe ature=related

12. Removing Static Electricity Grounding Grounding Connecting the object to the earth Connecting the object to the earth The charge is shared with the entire earth The charge is shared with the entire earth Discharge at a point Discharge at a point Objects made into a point have electrons pushed off the end. Objects made into a point have electrons pushed off the end.

13. Detecting Static Charge Electroscope -a device used to detect the presence of charge. (9-4) Electroscope -a device used to detect the presence of charge. (9-4) usually constructed with a metal plate or sphere at the top of a metal post with thin foil leaves hanging from the bottom of the post usually constructed with a metal plate or sphere at the top of a metal post with thin foil leaves hanging from the bottom of the post http://www.regentsprep.org/Regents/physics/p hys03/aeleclab/nerscope.htm http://www.regentsprep.org/Regents/physics/p hys03/aeleclab/nerscope.htm

15. Dangers of Static Electricity Cause fires Cause fires http://www.metacafe.com/watch/862578/static_el ectricity_causes_fire_at_gas_station/ http://www.metacafe.com/watch/862578/static_el ectricity_causes_fire_at_gas_station/ Can wreck electronics (need grounding wire) Can wreck electronics (need grounding wire) Can hurt (shock) or cause death (10-9) Can hurt (shock) or cause death (10-9) http://www.youtube.com/watch?v=CpxKEGdfDxI& feature=related http://www.youtube.com/watch?v=CpxKEGdfDxI& feature=related

16. Uses of Static Electricity (9-8) Electrostatic air cleaners Electrostatic air cleaners Removes dust and other particles by the attraction of unlike charges Removes dust and other particles by the attraction of unlike charges Electrostatic spray painting Electrostatic spray painting The paint and the object to be painted are given opposite charges The paint and the object to be painted are given opposite charges http://video.google.com/videoplay?docid=- 860069260229630847 http://video.google.com/videoplay?docid=- 860069260229630847

17. Uses of Static Electricity (9-11) Fabric softener sheets Fabric softener sheets Allows electric charge to move in between clothes instead of building up. Allows electric charge to move in between clothes instead of building up. Photocopiers Photocopiers Cell phones and car radios Cell phones and car radios