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Science 9 Electricity

Science 9 Electricity. Static Electric Charge. Static Electric Charge (9-2). Static electric charge- A charge on a substance that stays in the same place. + -. Examples of Static Charge. Lightning- (9-10) http://www.youtube.com/watch?v=gKPwkau0Dh0&feature=related

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Science 9 Electricity

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  1. Science 9Electricity Static Electric Charge

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

  3. + -

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

  5. Examples of Static Charge • Static shock-

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

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

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

  9. Producing Static Electricity • Charge by induction- (9-8) • 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. http://www.shep.net/resources/curricular/physics/P30/Unit2/electroscope.swf

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

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

  12. Removing Static Electricity • Grounding • Connecting the object to the earth • The charge is shared with the entire earth • Discharge at a point • 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) • 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/phys03/aeleclab/nerscope.htm

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

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

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

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