unit16(4)课件
日期：2012-03-05 20:30
writer，inventor，USdollarsBenjaminFranklinBenjaminFranklin1706--1790HewasanAmericanstatesman，Unit16ReadingPlannedbyCelinaLead-inDoyouknowwhothismanis?Whatarethese?Yes，andscientistBenFranklin’sTimetableWhat’sthepower?electricityreadingADDADPost-reading:1In1752scientistsalreadyknewwhatelectricityis()2Franklinwashelpedbyafriendtodotheexperiment()3Franklinmadethekiteofsilkbecausewetsilkdoesnotconductelectricity()4Acondenserwasusedintheexperimenttostoreelectricity()5Thekeytiedtothestringwasputintothedoortostopthekitefromflyingaway()Readingthefollowingstatementsanddecideiftheyare(T)orfalse(F)TTFFF2Answerthefollowingquestions:1)WhydidBenjaminFranklindothisexperimentwiththekite?2)Whyisitbettertomakethekiteofsilkthanofpaper?3)DoyouthinkFranklin’sexperimentwasdangerous?ExplainHewantedtoprovethatlightningandelectricityarethesamethingAsilkkitewilllastlongerinbadweatherthanapaperkiteYesBecauseifsthw，
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