intro to electricity - weeblysciencewithz.weebly.com/uploads/2/5/1/0/25106439/10.1...what is...
TRANSCRIPT
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INTROTOElectricity
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WHATISELECTRICITY
BRAINSTORM• Whatiselectricity?Writedownwhatyouthinkthedefinitionelectricityis…
BRAINSTORM• Whatiselectricity?Writedownwhatyouthinkthedefinitionelectricityis…
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WHATISELECTRICITYBRAINSTORM• LISTASMANYEXAMPLESTHATUSEELECTRICITYINYOURDAILYLIFE…….IN30seconds!!!!
GO!
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WHATISELECTRICITY
• REWRITEYOURTOP5OBJECTSTHATYOURWROTEDOWN
• ONASCALE(1-5),ratehowmuchyouwouldmissthethingsyouuseelectricity
• Besideyourtop5,whatcouldyouuse/doinsteadforeachitemifyoudidn’thaveelectricityatall?
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WHATWOULDYOUDO!?!?!
WhatwouldyoudoifonedayallelectricityintheprovinceofOntario
failed?Howwouldyoufeel?Howwouldyoucope?
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IceStorminToronto:2013
- 36cmoficedropped justbeforewinterbreak- 1.5millionpeoplewereaffected- 54-200milliondollarsworthofdamage- Someareaswereoutofpowerfor1daywhileotherswereoutofpowerfor5-7days.
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BlackoutinOntario
• August14th,2003• WorstblackoutinAmericanhistory• AffectedpartsofCanadaandnortheasternU.S.andOntario
• ItbeganwhenatreebranchtouchedapowerlineinOhioandspreadlikeawildfireaffectingover150millionpeople.
• Manypeoplereceivedpoweragain2dayslater,someaweeklater.
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MajorPowerOutagesintheWorld
1.BlackoutinIndia(2012)affecting620millionpeople2.BlackoutinCanadaandUSAaffecting150millionpeople3.BlackoutinBangladesh(2014)affecting150millionpeople4.BlackoutinIndonesia(2005)affecting100millionpeople5.BlackoutinBrazil(1999)affecting97millionpeople6.BlackoutinTurkey(2015)affecting70millionpeople7.BlackoutinItaly(2003)affecting55millionpeople8.Thelistgoeson!
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Aroundtheworld
Inorderforsomecountriestoconserveenergy,somehavepoweronduringcertaintimesoftheday
Forexample:inBeirut,electricityiscutforthreehourseverydaybetween6amand6pm(6am-9am,9am-12pm,12pm-3pmand3pm-6pm).
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Didyouknowthat…..
Electricitytravelsatthespeedoflight- morethan186,000milespersecond!
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Aboltoflightningcanmeasureuptothreemillion(3,000,000)volts,anditlastslessthanonesecond!
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Electricitycanbemadefromwind,water,thesunandevenanimalpoop.
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ThomasEdison inventedmorethan2,000newproducts,includingalmosteverythingneededforustouseelectricityinourhomes:switches,fuses,socketsandmeters.
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Electriceelscanproducestrongelectricshocksofaround500voltsforbothself-defenseandhunting.
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10.1ExploringStaticCharges(Pages403-410)
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Takeoutahighlightertofocuson“keywords”
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LearningGoals• IcanuseBohr-Rutherfordmodelstoexplainhowchargesmovebetweenmaterialsandhowmaterialsbecomecharged.
• Icanusetheelectrostaticseriestopredictthechargesofmaterialsthatarerubbedtogether.
• Icanexplainhowstaticelectricitycausesshocks,andhowgroundingcanpreventshocks.
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Electricity
#1.Electricity:aformofenergythatresultsfromtheinteractionofchargedparticles,suchaselectrons orprotons
•Onlyelectrons (negativecharges)move
• Protons(positivecharges)cannotmovebecausetheyarestuckinthenucleus
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StaticElectricity
2.Staticcharge(staticelectricity):anelectricchargethattendstostayonthesurfaceofanobject,ratherthanflowingawayquickly
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HOWABOUTTHIS……forstatic
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LETSCREATESOMESTATICELECTRICITY
• Raiseyourfeetandkeepyourfeetup
• Donottouchanyofthemetalonthechair,onlyplastic!
• Rubyourbumontheplasticseat,keepyourbackagainstthe
backrest,makesureyoudon’ttouchtheground!!!!
• Standupanddonottouch anything(yourdesk,chair,metalofthe
chair!!!NOTHING)
• Nowtouchthemetallegofyourchairquickly!
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VIDEOS: Electric VocabularyShould a person touch 200,000 volts?
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CausesofElectricCharges(summarizeforhw)
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ChargingByFriction
4.Chargingbyfriction: aprocessinwhichobjectsmadefromdifferentmaterialsrubagainsteachother,producinganetstaticchargeoneach
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ChargingByFriction
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ANYVOLUNTEERSWITHLONGHAIR?!?!?!
• 2volunteersandsomeonetokindlydonatetheirlonghair!
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ANYVOLUNTEERSWITHLONGHAIR?!?!?!
+
=
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ElectrostaticSeries
#5.ELECTROSTATICSERIES:alistofmaterialsthathavebeenarrangedaccordingtotheirabilitytoholdontoelectrons
•Usedtopredictchargesonmaterialsthatarerubbedtogether•Materialswithweakerholdonelectronsbecomepositive
•Materialswithstrongerholdonelectronsbecomenegative
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#5.ElectrostaticSeries
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#9.InsulatorsandConductors
• Insulator:amaterialinwhichelectronscannotmoveeasilyfromoneatomtoanother
• Conductor: amaterialinwhichelectronscanmoveeasilybetweenatoms
• Semiconductor: amaterialinwhichelectronscanmovefairlywellbetweenatoms
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Practice
• AnswerPage410#1-8• Completekeyconcepts(pg410)• CopyTable10.1(electrostaticseries)innotes• Summarizewhat“WhatCausesElectricCharges”intextbook
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#11.Grounding
• Ground:anobjectthatcansupplyaverylargenumberofelectronsto,orcanremoveaverylargenumberofelectronsfrom,achargedobject,thusneutralizingtheobject
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ElectricShock• Groundingpreventsthebuild-upofelectricchargeà avoidsshock• Insituationswhenshocksposehazards,peopleandequipmentmustbegrounded
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VIDEO:RefuelingFireCausedbyStaticElectricity
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VIDEO:DangersofStaticElectricity
VIDEO:TheAmazingPowerofStaticElectricity