INTROTOElectricity

WHATISELECTRICITY

BRAINSTORM• Whatiselectricity?Writedownwhatyouthinkthedefinitionelectricityis…

BRAINSTORM• Whatiselectricity?Writedownwhatyouthinkthedefinitionelectricityis…

WHATISELECTRICITYBRAINSTORM• LISTASMANYEXAMPLESTHATUSEELECTRICITYINYOURDAILYLIFE…….IN30seconds!!!!

GO!

WHATISELECTRICITY

• REWRITEYOURTOP5OBJECTSTHATYOURWROTEDOWN

• ONASCALE(1-5),ratehowmuchyouwouldmissthethingsyouuseelectricity

• Besideyourtop5,whatcouldyouuse/doinsteadforeachitemifyoudidn’thaveelectricityatall?

WHATWOULDYOUDO!?!?!

WhatwouldyoudoifonedayallelectricityintheprovinceofOntario

failed?Howwouldyoufeel?Howwouldyoucope?

IceStorminToronto:2013

- 36cmoficedropped justbeforewinterbreak- 1.5millionpeoplewereaffected- 54-200milliondollarsworthofdamage- Someareaswereoutofpowerfor1daywhileotherswereoutofpowerfor5-7days.

BlackoutinOntario

• August14th,2003• WorstblackoutinAmericanhistory• AffectedpartsofCanadaandnortheasternU.S.andOntario

• ItbeganwhenatreebranchtouchedapowerlineinOhioandspreadlikeawildfireaffectingover150millionpeople.

• Manypeoplereceivedpoweragain2dayslater,someaweeklater.

MajorPowerOutagesintheWorld

1.BlackoutinIndia(2012)affecting620millionpeople2.BlackoutinCanadaandUSAaffecting150millionpeople3.BlackoutinBangladesh(2014)affecting150millionpeople4.BlackoutinIndonesia(2005)affecting100millionpeople5.BlackoutinBrazil(1999)affecting97millionpeople6.BlackoutinTurkey(2015)affecting70millionpeople7.BlackoutinItaly(2003)affecting55millionpeople8.Thelistgoeson!

Aroundtheworld

Inorderforsomecountriestoconserveenergy,somehavepoweronduringcertaintimesoftheday

Forexample:inBeirut,electricityiscutforthreehourseverydaybetween6amand6pm(6am-9am,9am-12pm,12pm-3pmand3pm-6pm).

Didyouknowthat…..

Electricitytravelsatthespeedoflight- morethan186,000milespersecond!

Aboltoflightningcanmeasureuptothreemillion(3,000,000)volts,anditlastslessthanonesecond!

Electricitycanbemadefromwind,water,thesunandevenanimalpoop.

ThomasEdison inventedmorethan2,000newproducts,includingalmosteverythingneededforustouseelectricityinourhomes:switches,fuses,socketsandmeters.

Electriceelscanproducestrongelectricshocksofaround500voltsforbothself-defenseandhunting.

10.1ExploringStaticCharges(Pages403-410)

Takeoutahighlightertofocuson“keywords”

LearningGoals• IcanuseBohr-Rutherfordmodelstoexplainhowchargesmovebetweenmaterialsandhowmaterialsbecomecharged.

• Icanusetheelectrostaticseriestopredictthechargesofmaterialsthatarerubbedtogether.

• Icanexplainhowstaticelectricitycausesshocks,andhowgroundingcanpreventshocks.

Electricity

#1.Electricity:aformofenergythatresultsfromtheinteractionofchargedparticles,suchaselectrons orprotons

•Onlyelectrons (negativecharges)move

• Protons(positivecharges)cannotmovebecausetheyarestuckinthenucleus

StaticElectricity

2.Staticcharge(staticelectricity):anelectricchargethattendstostayonthesurfaceofanobject,ratherthanflowingawayquickly

HOWABOUTTHIS……forstatic

LETSCREATESOMESTATICELECTRICITY

• Raiseyourfeetandkeepyourfeetup

• Donottouchanyofthemetalonthechair,onlyplastic!

• Rubyourbumontheplasticseat,keepyourbackagainstthe

backrest,makesureyoudon’ttouchtheground!!!!

• Standupanddonottouch anything(yourdesk,chair,metalofthe

chair!!!NOTHING)

• Nowtouchthemetallegofyourchairquickly!

VIDEOS: Electric VocabularyShould a person touch 200,000 volts?

CausesofElectricCharges(summarizeforhw)

ChargingByFriction

4.Chargingbyfriction: aprocessinwhichobjectsmadefromdifferentmaterialsrubagainsteachother,producinganetstaticchargeoneach

ChargingByFriction

ANYVOLUNTEERSWITHLONGHAIR?!?!?!

• 2volunteersandsomeonetokindlydonatetheirlonghair!

ANYVOLUNTEERSWITHLONGHAIR?!?!?!

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ElectrostaticSeries

#5.ELECTROSTATICSERIES:alistofmaterialsthathavebeenarrangedaccordingtotheirabilitytoholdontoelectrons

•Usedtopredictchargesonmaterialsthatarerubbedtogether•Materialswithweakerholdonelectronsbecomepositive

•Materialswithstrongerholdonelectronsbecomenegative

#5.ElectrostaticSeries

#9.InsulatorsandConductors

• Insulator:amaterialinwhichelectronscannotmoveeasilyfromoneatomtoanother

• Conductor: amaterialinwhichelectronscanmoveeasilybetweenatoms

• Semiconductor: amaterialinwhichelectronscanmovefairlywellbetweenatoms

Practice

• AnswerPage410#1-8• Completekeyconcepts(pg410)• CopyTable10.1(electrostaticseries)innotes• Summarizewhat“WhatCausesElectricCharges”intextbook

#11.Grounding

• Ground:anobjectthatcansupplyaverylargenumberofelectronsto,orcanremoveaverylargenumberofelectronsfrom,achargedobject,thusneutralizingtheobject

ElectricShock• Groundingpreventsthebuild-upofelectricchargeà avoidsshock• Insituationswhenshocksposehazards,peopleandequipmentmustbegrounded

VIDEO:RefuelingFireCausedbyStaticElectricity

VIDEO:DangersofStaticElectricity

VIDEO:TheAmazingPowerofStaticElectricity