unit16-sicentistsatwork高一英语课件
日期：2010-12-22 12:52
Franklin’sFamousKiteExperimentThemainideaofeachpartPart1Para1toPara3BriefintroductionaboutthepurposeandresultofkiteexperimentPart2Para4toPara6HowtomakethekiteandhowtodotheexperimentToshowthatlightningandelectricityarethesameInJune1752Thestringwasgettingcharged，“I”collectandstoreagreatdealofelectricityinthecondenserTheexperimentprovesthatlightningandelectricityarethesameKiteExperimentMakeakiteTieasilkribbontothestringBuildtheframeofthekiteTiethecornersofthehandkerchiefMakeasmallcrossTiealongstringFixaverysharppieceofmetalFastenakeytotheendofthestringTrueorFalseIn1752scientistsalreadyknewwhatelectricityisFranklinwashelpedbyafriendtodotheexperimentFranklinmadethekiteofsilkbecausewetsilkdoesnotconductelectricityAcondenserwasusedintheexperimenttostoreelectricityThekeytiedtothestringwasputintothedoortostopthekitefromflyingawayTFFTFDiscussionDoyouthinkFranklin’sexperimentwasdangerous?ListthedifficultiesthatFranklinmetwhenhewasdoingthekiteexp，
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