实用机电英语（第二版） 课件 Unit 7 Are you skilled at wiring

实用机电英语（第二版）新编21世纪职业教育精品教材Contents1Areyoureadyforajobinterview?2Canyoureadtechnicaldescriptions?3Canyoureadusermanuals?4Doyouhavesafehabits?5Doyourecognizethesigns?6DoyouknowhowtoreplaceaGFCI?7Areyouskilledatwiring?8Howshouldyoudealwithanelectricshock?9Canyouliftheavythingssafely?Unit7：Areyouskilledatwiring?*

Communicatingwithco-workersaboutIECwiringcodes*

Understandingsimpleandcompoundcircuits*DrawingadiagramusingIECwiringcodesContents1LEADIN2LISTENING&SPEAKING3READING

4LIFE&CULTURE01LEADINActivity1：Recognizethecolorsoftheconductors.brownredgreen-yellowblackbluegreyActivity2：Matchtheexpressionstothepictures,thenfillintheblanks.1.PictureAisa

thatTomwantstoread.2.PictureBis

fortheprotectiveground/earth.3.PictureCis

forabatterypowersupply.ABC()acircuitsymbol()awiringdiagram()alabelCABa

wiringdiagramalabelacircuitsymbol02LISTENING&SPEAKINGActivity3:Listentothedialogueandgettheroughidea.LiuMingisworkinginthedistributionroom.HeistalkingwithTomabouthiswork.

Tom:Hi,LiuMing.Whatareyoudoing?LiuMing:Hi,Tom.I’mreadingawiringdiagram.I’mgoingtoinstallalightforthemeetingroom.Tom:Readingwiringdiagramsisdifficult,isn’tit？LiuMing:Yes,itis.Therearetoomanycircuitsymbols.Tom:Indeed,therearesomanysymbols.Whatdoesthissymbolmean?LiuMing:That’sasimpleone.Itmeans“avoltmeter”.Tom:Howaboutthisone?LiuMing:Isupposeitmeans“anAcSource”.Tom:Trythisone.LiuMing:It’sadifficultone.Doesitmean“aDCpowersupply”?LiuMingispracticing.Tom:Goodjob.WhatcolorisfortheprotectiveearthaccordingtoIEC(InternationalElectrotechnicalCommission)colorcodes?LiuMing:Isupposeitisthegreen-yellowone.Tom:Whatisthelabel?LiuMing:ThelabelisPE.Tom:Welldone!

Activity3:Listentothedialogueandgettheroughidea.Activity4:Roleplay

Scenario:Youworkinaforeigncompany.Youandyourpartnerareworkinginthedistributionroom.alightbulbanammeterProtectiveEarthFunctionLabelIECColourNeutralNblueLine,singlephaseLBrownUsefulsentencestructures:Whatdoesthissymbolmean?Whatdoesthissymbolstandfor?Itmeans…Itstandsfor…Isuppose…

A:Hi,…Whatareyoudoing?B:Hi,…I’mreadingawiringdiagram.…I’mgoingto…A:Whatdoesthissymbolmean?B:Itmeans…A:…Activity

4:Roleplay03READINGActivity

5:Readthepassage.Workoutthewiringcolorcodes

MostofEuropeabidesbyIEC(InternationalElectrotechnicalCommission)wiringcolorcodesforACbranchcircuits.ThesearelistedinTablebelow.

IECACpowercircuitwiringcolorcodes.Activity5:Readthepassage.

FunctionLabelIECColorProtectiveearthPEgreen-yellowNeutralNblueLine,singlephaseLbrownLine,1-phaseL1brownLine,2-phaseL2blackLine,3-phaseL3greyActivity

6:Askyourpartnerthefollowingquestions.WhatdoesPEstandfor?Whatcolorisusedforthe“protectiveearth”wire?Whatcolorisusedfortheneutralline?Whatcolorisusedforasinglephaselinewire?Whatcolorisusedfora2-phase(L2)linewire?Whatcolorisusedfora3-phase(L3)linewire?Protectiveearth.Green-yellow.Blue.Brown.Black.Grey.Activity7:Readthesimplecircuitandfillintheblanks.

Activity7:Readthesimplecircuitandfillintheblanks.FIGURE1—Asimplecircuitwillalwayscontainatleastthreeofthefivedifferentcomponentsshownhere—thepowersource,load,andconductors.SayaloudthefivecomponentsshowninFigure1.(1)__________________

(2)_____________________

(3)_

_________________(4)____________________(5)___________________SOURCECONDUCTORSSWITCHFUSELOADActivity8:Readacompoundcircuitdiagram.

Activity8:Readacompoundcircuitdiagram.

Wiringsystemscanbeconnectedupas“parallel”or“series”circuits,orcombinationsofeach.

Figure2showsacircuit.Intheschematicview,theheaterandswitchareconnected“inseries”witheachother–theelectricitygoesthroughtheswitchbeforeitreachtheheater..

Thefanmotorisconnected“inparallel”withthem–theelectricitygoesdirectlytothefan(withoutgoingthroughtheswitchfirst),andtotheswitch.–Eachhavingitsownsupplylinefromacommonsource.Thecircuithastwoparallelbranches.Onebranchhasonlyonepart,thefanmotor,theotherbranchcontainstwoparts“inseries”-theheaterandtheswitch.Inthisdiagram,theswitchcontrolsonlytheheatingelement,notthefan.Thisisaseries-parallelcombination,orcompoundcircuitActivity9:Readthetextagainandthenfillintheblankswiththegivenwords.A.parallelB.heaterC.motorD.branchesE.twoF.controlsG.switchH.seriesI.fanJ.compoundWiringsystemscanbeconnectedupas“_______”or“__________”circuits,orcombinationsofeach..Figure2showsacircuit.Intheschematicview,the_______and_________areconnected“inseries”witheachother–theelectricitygoesthroughtheswitchbeforeitreachtheheater..Thefan_________isconnected“inparallel”withthem–theelectricitygoesdirectlytothe_____(withoutgoingthroughtheswitchfirst),andtotheswitch.–eachhavingitsownsupplylinefromacommonsource.Thecircuithas_____parallelbranches.One_______hasonlyonepart,thefanmotor,theotherbranchcontainstwoparts“inseries”-theheaterandtheswitch.Inthisdiagram,theswitch