电工英语电子课件unit4.ppt

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1、ELECTRICAL ENGLISH英语英语电工电工Unit 1 Job and WorkplaceUnit 2 Electrical Tools and MaterialsUnit 3 House WiringUnit 4 Measuring InstrumentsContents Unit 5 Motors and TransformersLesson10 Instrument ClassificationLesson 11 Using the MultimeterLesson 12 Using the OscilloscopeUnit 4 Measuring InstrumentsLes

2、son10 Instrument ClassificationGoal Identify basic types and functions of basic measuring instrumentLook and Study DialogueReadingFurther StudyWords and Phrases Unit 3 Lesson 4 Look and Study Dialogue Reading Further Study104Words and PhrasesA.Look up the words and phrases below in a dictionary.Fill

3、 in the blanks with both Chinese and English answers according to the pictures.contactor;electricalresistance;inductor;magneticfield;alternatingcurrent;dial1._2._3._contactor接触器electricalresistance电阻inductor电感 Unit 3 Lesson 4 Look and Study Dialogue Reading Further Study104Words and PhrasesA.Look up

4、 the words and phrases below in a dictionary.Fill in the blanks with both Chinese and English answers according to the pictures.contactor;electricalresistance;inductor;magneticfield;alternatingcurrent;dial4._5._6._dial刻度盘magneticfield磁场alternatingcurrent交流电 Unit 3 Lesson 4 Look and Study Dialogue Re

5、ading Further Study4Words and PhrasesB.Look up the measuring instrument names below in a dictionary.Fill in the blanks with both Chinese and English answers according to the pictures.ohmmeterammetervoltmeterwattmeter1._2._3._4._10ammeter安培表voltmeter伏特表wattmeter功率表ohmmeter欧姆表 Unit 3 Lesson 4 Look and

6、 Study Dialogue Reading Further Study74Words and PhrasesJohn参加电机维修的实习，正尝试确定新安装的接触器不能正常工作的故障原因，并向Peter（B）求助。A:Peter,givemeahand.B:Whatsthetroublewithyou？John.A:Iwantedtomakesurethenew contactors werentgoingtooverload the24volttransformer,soIstartedcheckingresistanceofthecoilswithmyohmmeter.Bymyreadin

7、gofOhms law,Igotthe relationship betweenelectromotive force andresistance.Butactualcurrentmeasured islikewrongvalue?SowhatamIdoingwrong?10 Unit 3 Lesson 4 Look and Study Dialogue Reading Further Study74Words and PhrasesJohn参加电机维修的实习，正尝试确定新安装的接触器不能正常工作的故障原因，并向Peter（B）求助。B:John,Whatasillymistakeyoumad

8、e!OhmsLawinitsbasicformonlyappliestopurely resistive circuits.Thecoilinthecontactorisnotaresistivecircuit.Itisaninductivecircuit.Inductors haveanadditionalresistanceduetothefluxofthemagneticfieldwhenalternatingcurrentisappliedtothecoil.A:Igotit.10 Unit 3 Lesson 4 Look and Study Dialogue Reading Furt

9、her Study74Words and PhrasesA.Choose the best answer1.WhatwasthetroublewithJohn?_A.Thenewcontactorscantwork.B.Hedoesntknowhowtouseohmmeter.C.Theohmmetercantwork.D.Thecoilsofcontactorscantwork.2.OhmsLawinitsbasicformonlyappliestocircuits.A.purelyinductive;B.purelyresistive;C.any;D.Lowvoltage3.Inducto

10、rshavewhenalternatingcurrentisappliedtothecoil.A.noresistance;B.anadditionalresistance;C.nomagneticfield;D.noelectromotiveforce10ABB Unit 3 Lesson 4 Look and Study Dialogue Reading Further Study74Words and PhrasesB.Reorder the letters with your partner.LettersWordswlaoiclicmagnetanceresistshiprelati

11、on10relationshiplawcoilmagneticresistance Unit 3 Lesson 4 Look and Study Dialogue Reading Further Study74Words and Phrases测量量仪器的分器的分类Thethreebasicquantitiesintheelectricalmeasurementarecurrent,voltageandpower.Thenecessaryrequirementsforanymeasuringinstrumentsare:a)Withtheintroductionoftheinstrumenti

12、nthecircuit,thecircuitconditionsshouldnotbealtered.Thusthequantitytobemeasuredshouldnotgetaffectedduetotheinstrumentused.b)Thepowerconsumedbytheinstrumentsfortheiroperationshouldbeassmallaspossible.10 Unit 3 Lesson 4 Look and Study Dialogue Reading Further Study74Words and Phrases测量量仪器的分器的分类Theinstr

13、umentwhichmeasuresthecurrentflowinginthecircuitiscalledammeterwhiletheinstrumentwhichmeasuresthevoltageacrossanytwopointsofacircuitiscalledvoltmeter.Theinstrumentswhichareusedtomeasurethepowerarecalledpowermetersorwatt-meters.Electricalmeasuringinstrumentsaremainlyclassifiedas:10 Unit 3 Lesson 4 Loo

14、k and Study Dialogue Reading Further Study74Words and Phrases测量量仪器的分器的分类a)IndicatingInstruments:Theseinstrumentsmakeuseofadialandpointerforshowingorindicatingmagnitudeofunknownquantity.b)RecordingInstruments:Theseinstrumentsgiveacontinuousrecordofthegivenelectricalquantitywhichisbeingmeasuredoverasp

15、ecificperiod.c)Integratinginstruments:Theseinstrumentsmeasurethetotalquantityofelectricitydeliveredoverperiodoftime.10 Unit 3 Lesson 4 Look and Study Dialogue Reading Further Study74Words and PhrasesA.List the basic types of electrical measuring quantity and instrument.10quantityinstrumentpowercurre

16、ntvoltageintegratinginstrumentsindicatinginstrumentsrecordinginstruments Unit 3 Lesson 4 Look and Study Dialogue Reading Further Study74Words and PhrasesB.Read the passage again and answer the questions.101.Theinstrumentwhichmeasuresthevoltageacrossanytwopointsofacircuitiscalled.2.Theinstrumentswhic

17、hareusedtomeasurethepowerarecalled.3.Theinstrumentwhichmeasuresthecurrentflowinginthecircuitiscalled.voltmeterwatt-metersammeter Unit 3 Lesson 4 Look and Study Dialogue Reading Further Study74Words and PhrasesC.Learn the important grammar and phrase in the text.1.While引导由含有转折关系的两个分句构成的并列句，表示对比。Thein

18、strumentwhichmeasuresthecurrentflowinginthecircuitiscalledammeterwhiletheinstrumentwhichmeasuresthevoltageacrossanytwopointsofacircuitiscalledvoltmeter.测量电路电流的仪器称为安培表，而测量电路中任意两点之间电压的仪器称为伏特表。练习：他出去散步了，而我却待在家里。英文：2.which引导限定性定语从句Theseinstrumentsgiveacontinuousrecordofthegivenelectricalquantitywhichisb

19、eingmeasuredoveraspecificperiod.这些仪器记录电气参数在被测量的某一特定期间内的连续值。练习：这是准备搬进城的一家人.提示：moveto英文：10Hewentoutforawalk,whileIstayedathome.Thisisthefamilywhichisplanningtomovetothecity.Unit 3 Lesson 4 Look and Study Dialogue Reading Further Study74Words and PhrasesOhms Law and Watts Law.Ohmslawdeterminestherelati

20、onshipbetweenVoltage(V),Current(I),andresistance(R).Thesimpleformula（公式）canbeusedtodetermineoneunknown（未知）variable（变量）iftheothertwovariablesareknown.RelatedtothisisWattsLaw（瓦特定律）whichincludescalculations（计算）forpower.10 Unit 3 Lesson 4 Look and Study Dialogue Reading Further Study74Words and PhrasesO

21、hms Law and Watts Law.Powerisameasureoftheoverall（全部的）amountofworkbeingdoneinasysteminrelationto（有关）time(energyusedpersecond每秒).InanelectricalsystempowercanbecalculatedbyusingtheformulaP=VI.Fromthisyoucanseehowthevoltageandcurrentinasystemrelatetotheoverallamountofpowerused.TheunitofaWatt(W)isequiva

22、lentto（等于）joulespersecond（焦耳每秒）,thereforeoneWattisequalto（等于）onejoulepersecond.10 Unit 3 Lesson 4 Look and Study Dialogue Reading Further Study74Words and Phrases10contactorkntktn.接触器overload,uvludvt.超载resistancerizistnsn.电阻coilkiln.线圈ohmmeterum,mi:tn.电欧姆表ohmumn.欧姆lawl:n.法律；规律relationshiprileinipn.关

23、系electromotivei,lektrumutivadj.电动势的forcef:sn.力，力量actualktuladj.真实的，实际的measuremevt.测量valuevlju:n.值purelypjuliadv.纯粹地，仅仅resistiverizistivadj.电阻式的inductiveindktivadj.感应的inductorindktn.电感duedju:adj.由于，因为fluxflksn通量magneticmnetikadj.有磁性的alternating:lt,neitiadj.交替的，交互的quantitykwnttin.量measurementmemntn.测量

24、powerpaun.功率introduction,intrdknn.引进；介绍conditionkndinn.条件；情况alter:ltvt.改变thussconj.因此affectfektvt.影响consumeknsju:mvt.消耗ammetermitn.电流表voltmetervult,mi:tn.电压表watt-meterwt,mi:tn.功率表classifyklsifaivt.分类dialdailn.刻度盘pointerpintn.指针magnitudemnitju:dn.量级unknownnnunadj.未知的integrateintireitvt.使成整体，求的积分 Unit

25、 3 Lesson 4 Look and Study Dialogue Reading Further Study74Words and Phrases10Ohmslaw欧姆定律electromotiveforce电动势dueto由于magneticfield磁场alternatingcurrent交流电Lesson 11 Using the MultimeterGoal Learn useful expressions for using multimeterLook and Study DialogueReadingFurther StudyWords and Phrases Unit 3

26、 Lesson 4 Look and Study Dialogue Reading Further Study114Words and PhrasesA.Look up the words and phrases below in a dictionary.Fill in the blanks with both Chinese and English answers according to the pictures.testlead;ACcompressor；capacitor;resistor;DC;diode1._2._3._capacitor电容器ACcompressor交流压缩机r

27、esistor电阻器 Unit 3 Lesson 4 Look and Study Dialogue Reading Further Study114Words and PhrasesA.Look up the words and phrases below in a dictionary.Fill in the blanks with both Chinese and English answers according to the pictures.testlead;ACcompressor；capacitor;resistor;DC;diode4._5._6._4diode二极管;5.D

28、C直流电;6.testlead测试引线diode二极管DC直流电testlead测试引线 Unit 3 Lesson 4 Look and Study Dialogue Reading Further Study4Words and PhrasesB.Look up multimeter names below in a dictionary.Fill in the blanks with both Chinese and English answers according to the pictures.analogmultimeterdigitalmultimeter111._2._dig

29、italmultimeter数字万用表analogmultimeter模拟万用表 Unit 3 Lesson 4 Look and Study Dialogue Reading Further Study74Words and PhrasesJane（B）给他的朋友Peter（A）打电话，谈起她刚刚完成的空调修理工作。A:Hello,Petersspeaking.B:Peter，ImJane.A:Hi,Jane!Whatsnew?B:Ihavejustfinishedmyfirstair-conditionerrepairingtask.A:Really?Whatsitlike?B:Anair

30、-conditionerofourcustomerwasnotworking.Icheckedthecapacitorofcompressormotorwithamultimeterandfoundeditneedreplacement.11 Unit 3 Lesson 4 Look and Study Dialogue Reading Further Study74Words and PhrasesJane（B）给他的朋友Peter（A）打电话，谈起她刚刚完成的空调修理工作。A:Howdoyouknowthat?B:Atypicalcapacitorfailurewillcauseamoto

31、rnottohavetheextra kick togettostartup.Idischargedthecapacitorfirstandtesteditwithamultimeter.Theresultshowedthecapacitordidntholdacharge.A:Welldone,Jane.11 Unit 3 Lesson 4 Look and Study Dialogue Reading Further Study74Words and PhrasesA.Listen to the dialogue and circle Yes or No.1.Peterhasjustfin

32、ishedair-conditionerrepairingwork.YesNo2.Johncheckedthecapacitorofcompressormotorwithanohmmeter.YesNo3.Thecapacitorisfailurebecauseitdidntholdacharge.YesNo10NoNoYes Unit 3 Lesson 4 Look and Study Dialogue Reading Further Study74Words and PhrasesB.Reorder the letters with your partner.11LettersWordsk

33、kciurefailcaltypidischargementreplacereplacementkickfailuretypicaldischarge Unit 3 Lesson 4 Look and Study Dialogue Reading Further Study74Words and Phrases万用表的使用万用表的使用Amultimeterisoneofthemostuseful diagnostic toolsaround.Itsusefulintestingpowersupplies,butitalsocanbeusedtotestfuses,resistors,andba

34、tteries.Multimetersaredesignedtoperformmanydifferenttypesofelectricaltests,includinga)DCvoltageb)ACvoltagec)Resistance(Ohms)d)Diodese)Amperage11 Unit 3 Lesson 4 Look and Study Dialogue Reading Further Study74Words and Phrases万用表的使用万用表的使用Allmultimetersareequippedwithredandblacktestleads.Whenusedforvo

35、ltagetests,theredisattachedtothepowersourcetobemeasured,andtheblackisattachedtoground.Multimetersusetwodifferentreadoutstyles:digitalandanalog.Digitalmultimetersareusuallyauto ranging,whichmeanstheyautomatically adjust tothecorrectrangeforthetestselectedandthevoltagepresent.Analogmultimetersmustbese

36、tmanuallytothecorrectrangeandcanbedamagedmoreeasilybyovervoltage.Multimetersaredesignedtoperformtestsintwoways:inseriesandinparallel.Mosttestsareperformedinparallelmode,inwhichthemultimeterisnotpartofthecircuitbutrunsparalleltoit.11 Unit 3 Lesson 4 Look and Study Dialogue Reading Further Study74Word

37、s and PhrasesA.List Basic types of electrical tests with multimeter.111._2._3._4._5._AmperageDCvoltageACvoltageResistance(Ohms)Diodes Unit 3 Lesson 4 Look and Study Dialogue Reading Further Study74Words and PhrasesB.Match the English with the Chinese.Draw lines.11Beequippedwithcentralheating执行电气测试ba

38、tteriesinseries装有集中供暖resistancesinparallel串联电池performelectricaltests并联电阻 Unit 3 Lesson 4 Look and Study Dialogue Reading Further Study74Words and PhrasesC.Learn the important grammar and phrase in the text.1.adjustto调整到Digitalmultimetersareusuallyautoranging,whichmeanstheyautomaticallyadjusttothecor

39、rectrangeforthetestselectedandthevoltagepresent.数字万用表通常有自动的量程，它们可以根据所选择的测试和当前电压自动调整到正确的量程。练习：所有的数值自动调整到了正确的设置。提示：values,settings英文：2.which引导非限定定语从句Mosttestsareperformedinparallelmode,inwhichthemultimeterisnotpartofthecircuitbutrunsparalleltoit.大多数的测试以并联的方式完成。在这种方式下，万用表不属于（工作）电路的一部分，而是与（工作）电路并行运行。练习：

40、上周末我去了教堂，我妹妹在那举行过婚礼。提示：getmarried英文：11Allthevaluesautomaticallyadjusttothecorrectsettings.LastweekendIwenttothechurch,inwhichmysistergotmarried.Unit 3 Lesson 4 Look and Study Dialogue Reading Further Study74Words and PhrasesDigital Multimeter Operation Manual-Dos and DontslUsetherightinputjack（插孔）,f

41、unction（功能）andrange.lDonottakemeasurementsthatexceed（超过）theprotectionlimitvaluesindicatedinthespecifications（说明书）.lDonottouch(接触)themetaltips（尖端）ofthetestleadswhenthemeterisconnectedtothecircuittobemeasured.lDonottakevoltagemeasurementifthevaluebetweentheterminals（终端）andearthgroundexceeds1000V.lSele

42、ctthehighestrangeifthevaluescale（等级）tobemeasuredinthemanualrangeisunknown.11 Unit 3 Lesson 4 Look and Study Dialogue Reading Further Study74Words and PhrasesDigital Multimeter Operation Manual-Dos and DontslDonotconnectthemetertoanyvoltagesourcewhiletherotaryselector（旋转式选择器）isinthecurrent,resistance

43、,capacitance（电容）,diode,continuityrange.lDisconnectthetestleadsfromthecircuitundertestbeforeturningtherotaryselectortochangefunctions.lDonotmeasuretheresistance,capacitance,diodeorcontinuityoflivecircuits(通电电路).lDonottakecapacitancemeasurementsuntilthecapacitortobemeasuredhasbeenfullydischarged.lStop

44、usingthemeterifanyabnormalities（异常情况）orfaultsareobserved（观测）.11 Unit 3 Lesson 4 Look and Study Dialogue Reading Further Study74Words and Phrases11air-conditionern.空调capacitorkpsitn.电容器compressorkmpresn.压缩机multimetermltimitn.万用表replacementripleismntn.更换typicaltipikladj.典型的failurefeiljn.故障extraekstrad

45、j.额外的kickkikn.反冲力dischargedist:dvt放电charget:dn.电荷diagnostic,dainstikadj.诊断的resistorrizistn.电阻器performpf:mvt.执行；完成diodedaiudn.二极管equipikwipvt.装备，配备leadli:dn.引线sources:sn.来源readoutri:dautn.读出digitaldiditladj.数字的analognladj.模拟的auto:tuadj.自动的rangereindvt.(在范围内)变动;n.范围automatically,:tmtikliadv.自动地adjustd

46、stvt.调整selectsilektvt.挑选presentprezntvt.出现；显示，呈现manuallymnjuliadv.手动地damagedmidvt.损坏overvoltage,uvvultidn过电压seriessiri:z,-rizn.串联parallelprleln.平行 Unit 3 Lesson 4 Look and Study Dialogue Reading Further Study74Words and Phrases11startup发动DCabbr.直流电（directcurrent）ACabbr.交流电（AlternatingCurrent）equipwi

47、th配备testlead测试引线adjustto调整到inseries串联inparallel并联Lesson 12 Using the OscilloscopeGoal Learn useful expressions for using oscilloscopeLook and Study DialogueReadingFurther StudyWords and Phrases Unit 3 Lesson 4 Look and Study Dialogue Reading Further Study124Words and PhrasesA.Look up the words and p

48、hrases below in a dictionary.Fill in the blanks with both Chinese and English answers according to the pictures.wave;charger;rectifier;PCB;oscilloscope;signal1._2._3._charger充电器PCB印刷电路板oscilloscope示波器 Unit 3 Lesson 4 Look and Study Dialogue Reading Further Study124Words and PhrasesA.Look up the word

49、s and phrases below in a dictionary.Fill in the blanks with both Chinese and English answers according to the pictures.wave;charger;rectifier;PCB;oscilloscope;signal4._5._6._4.rectifier整流器;5.signal信号;6.wave波rectifier整流器rectifier整流器signal信号wave波 Unit 3 Lesson 4 Look and Study Dialogue Reading Further

50、 Study74Words and PhrasesJane（A）看到Peter（B）正在研究一个充电器的电路图，于是提出了几个问题。A:Peter,hereisabatterychargercircuitdiagram.Whatsthecomponentinsquarec5?B:Thatsatransformer,John.A:Oh,Isee.Whatwillyoudowiththediagram,aPCB?B:No.Mybossonlywantsmetotestthebatterychargerwithanoscilloscope.A:Imnotquitesurewheretotestit.