8BChapter4Adangerousservant8BChapter31.Whatdoyouthinkofelectricity?Why?2.Electricitygivespowerforallkindsofelectricalappliances.Canyounamesomeoftheelectricalappliancesweuseinourlives?(Whenwepluganapplianceintothewallsocket,weareusingelectricityproducedbyagenerator.)electricalappliancesanairconditionerablenderaCDplayeracomputeracookerahairdryeralampakettleelectricalappliancesaheaterafananironamicrowaveanovenaprinterelectricalappliancesarecorderarefrigeratoraTVsetavacuumcleaneravideoplayerawashingmachineamobilephone(afridge)arobotWheredoesarobot’senergycomefrom?Itsenergycomesfromelectricity.Wheredoesourenergycomefrom?(Energyisthepowerthatmakesthingswork.)Perhapswithoutelectricityourliveswillnotbeinteresting.Nowletustalkaboutelectricity.Whatisit?Electricityisthepowerwhichisproducedbyrubbing(friction),byamachinecalledageneratororbychemicalmeans(e.g.abattery).Canweseeit?No,it’sakindofenergythatwecannotsee.It’sinvisible.Canwetouchit?No,wecan’t.Wemaygetanelectricshock.It’sdangerous.PowerstationspylonshomeDoyouknowhowelectricitycomestous?Thepylonscarrywires.Wirescarryelectricity.Electricitycomesintoourflatsthroughthinwires,andthethinwiresareconnectedtothickwires.Thethickwiresarecalledcablesandtheyareburiedunderground.Cablesareconnectedtopowerstations.Powerstationsmakeelectricity.Homework:1.Gooverthevocabularyitemsandrecitethem.2.Listentotherecordingofthearticleandreaditaloudseveraltimes.3.FinishEx.C/D/Eonpage46,47.8BChapter4Adangerousservant8BChapter3Ex.Fillintheblankswithproperwords:wireenergycableshock1.Youngpeoplehavemorethanoldpeople.2.Don’ttouchthe!You’llgetanelectric.3.Whentheworkersweredigginguptheroad,theycutthe,andasaresult,therewasablackoutinthearea.athreadofmetalthepowerthatmakesthingsworkathick,strongropemadeofwireaverystrongforceorblowaperiodofdarknesscausedbyacutintheelectricitysupplyWecanchangeelectricityintoenergythatwecansee,hear,orfeel.Wecanalsochangeitintoenergythatmovethings.lightenergysoundenergyheatenergymovementenergy(movement---movingorbeingmoved)Canyoutellwhatkind(s)ofenergydotheyproduce?Vocabularyelectricityn.electrica.电的，电动的，发电的electriccables电缆anelectrickettle电壶electriccurrent电流electricala.电的，电气科学的electricalappliances电器anelectricalengineer电气工程师electriciann.电工，电学家Ifanyoftheelectricalappliancesorthewiringinyourhomeisoutoforder,youneedtofindanelectriciantorepairthem.1)Whendidthestoryhappen?2)Bennydidn’twanttotrickDaisy,didhe?3)DoesBennyknowwhatelectricityis?4)Whymustwebecarefulwithelectricity?5)Howdoeselectricitycomeintoourhomes?6)Whatarethewiresconnectedto?7)WhatdidDaisybuyforherbrother?8)DoesDaisyknowwhatelectricityis?9)Howdobatterieswork?10)WhatdoyouthinkofBennyandDaisy?Readaloudthearticleandanswerthefollowingquestions:I.Completethesentences:1)It’stotouchtheelectricitywithyourhand.(danger)2)Wecanbuysugarin.(pack)3)Hehadnoforwhyhewaslate.(explain)4)Water.hasthree---solid,liquidandgas.(form)5)Thethiefthetreasureunderthetree.(bury)6)Intheolddays,therichusuallyaskedtodothehouseworkforthem.(serve)7)Timworksasanewspaperboyandhegetshispayfromhisboss.(month)Homework:II.Readandreciteparagraphs4~13.III.Readandrecitethewordsandexpressions.8BChapter4Adangerousservant8BChapter3Publictransporttrainbusundergroundplanemaglevtrainphrases热能/电能/声能动能/原子能精力充沛的不同形式的能量一包信件一盒20支香烟终于起先埋电缆在...
