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Science 9ElectricityStatic Electric Charge
Static Electric Charge (9-2)
Static electric charge- A charge on a substance that stays in the same place
Examples of Static ChargeLightning-(9-10)
Examples of Static ChargeStatic shock-
Producing Static ElectricityCharge by Friction- (9-3)Electric charge is transferred by rubbing object together
Producing Static ElectricityWe 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 ElectricityCharge by conduction (contact)- (9-5)Charge is transferred by touching a charged object to an uncharged object
Producing Static ElectricityCharge 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.
Laws of Electric Charge (9-2)Unlike charges attract one anotherLike charges repel one another
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)
Removing Static ElectricityGroundingConnecting the object to the earthThe charge is shared with the entire earthDischarge at a pointObjects made into a point have electrons pushed off the end.
Detecting Static ChargeElectroscope -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
Dangers of Static ElectricityCause fireshttp://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
Uses of Static Electricity (9-8)Electrostatic air cleanersRemoves dust and other particles by the attraction of unlike chargesElectrostatic spray paintingThe paint and the object to be painted are given opposite chargeshttp://video.google.com/videoplay?docid=-860069260229630847
Uses of Static Electricity (9-11)Fabric softener sheetsAllows electric charge to move in between clothes instead of building up.PhotocopiersCell phones and car radios