Unit_4《Global_Warming》说课稿2(人教版选修6).doc

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1、Unit4GlobalWarmingPeriod1WarmingUpTeachingGoals:1.Toarousestudents’interestinlearningaboutglobalwarming.2.Togetstudentstoknowtheenergysource.Teachingprocedures:Step1.Leading-inPurpose:Toactivatestudentsandarousethemtotalkaboutglobalwarming.T:Hello,everyone.Todaywearegoingt

2、oreadaboutglobalwarming.Butfirstlet’sthinkaboutwhatmovestheworldaround.Yes,itisenergy.Butwhatisenergy?Energyisafundamentalquantitythateveryphysicalsystempossesses;itallowsustopredicthowmuchworkthesystemcouldbemadetodo,orhowmuchheatitcanproduceorabsorb.Inthepast,energywasdi

3、scussedintermsofeasilyobservableeffectsithasonthepropertiesofobjectsorchangesinstateofvarioussystems.Basically,ifsomethingchanges,somesortofenergywasinvolvedinthatchange.Renewableenergysourceslikewindpowerdon’temitcarbondioxide.Step2WarmingupPurpose:Toleadstudentstothetopi

4、cofthisunit.1.PairworkGetstudentstoaskeachotherthefollowingquestions,andthenaskthemtopresentitbeforetheclass.(1)Whatisenergy?(2)Wheredoesitcomefrom?(3)Whatenergysourcesarerenewable?(4)Whatenergysourcesarenon-renewable?2.Groupwork(1)Getstudentstotalkaboutsourcesofenergyacco

5、rdingtothephotosinthetextbook.TheabovepicturescanbeusedforSstotalkabout,andSscanalsotalkasmuchastheycan.BylearningWarmingUpweallknowthatenergyissoimportant,butwheredoesitcomefrom?Therearedifferentformsofenergy:Windenergy风能Heatenergy热能ChemicalChemicalenergy化学能源Nuclearenergy

6、核能Solarenergy太阳能Waterpower水力发电能源类型定义实例一次能源直接来自自然界而未经加工转换的能源化石燃料、太阳能、核能、生物燃料、水能等二次能源由一次能源直接或间接转化而来的能源电能、煤气、汽油、沼气、氢能等可再生能源不随其本身的转化或被人类利用而减少的能源太阳能、生物能、水能、风能、地热能等非再生能源随其本身的转化或被人类利用而减少的能源化石燃料、核燃料(2)ConclusionWhenenergychangesfromoneformtoanother,theamountofenergystaysthesame.En

7、ergycannotbemadeordestroyed.Thisfactiscalled“conservationofenergy”.Mattercanbemadeintoenergythroughprocesseslikenuclearfissionandnuclearfusion.3.Competition:TakethequizbelowandseewhetherSscanfillintheblanks.ThingsthatuseenergySourcesofenergyRenewable/non-renewablelightshea

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