analog instruments and uses

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1、UnitThreeElectronicApparatusandInstrumentsPassageTwoAnalogInstrumentsandUsesCopyrightYuanhaiyingusefultermsofanaloginstrumentsandusesDifficultpoints:usethespecialtywordstodescribeanaloginstrumentsandusesKeypoints:Requirements:1.haveagoodcommandofusefultermsofelectroniccomponents2·canusethelearne

2、dtermstodescribedifferenttypesofelectroniccomponentsLeadingin-RevisionTalkaboutelectroniccomponents.(choosetwogroupsofstudentstodoit)Leadingin-Revisionmagnetmilliampererectifiermetervoltmeterammeter*aunitofelectriccurrentequaltoonethousandthofanampere.Abbreviation:mAanelectronicdeviceforchanging

3、ACtoDCanobjectthatisablebothtoattractironandsteelobjectsandalsopushthemawayadevicethatmeasurestheamountofsomethingthatisusedNewwordsandexpressionscoil/kɔɪl/n.线圈，线组，感应器primarycoil初级线圈secondarycoil次级线圈permanent/‘pɜː.mə.nənt/adj.永久性的,耐久iron/'aiən/铁Strikewhiletheironishotelectrodynamicadj.电力学的~s电力学e

4、lectrostatic/ɪ,lek.trəʊ‘stæt.ɪk/adj.静电的,静电学的~s静电学instrument[‘instrumənt]仪器;器械,仪表,装置,设备Analoginstrumentspermanentmagnetmoving-coilinstrumentsfordirectcurrentandvoltagesrectifierinstrumentsforalternatingcurrentsandvoltagesmovingironinstrumentsforalternatingcurrentsandvoltageselectrodynamicinstrume

5、ntsforthemeasurementofthecurrentandvoltageelectrostaticvoltmeter测交流电流及电压动铁式仪表测直流电流与电压的永磁可动线圈式仪表milliammeter电动式伏特计测交流电流及电压整流式仪表PMMCmeters测量电流与电压的电动式仪表Newwordsandexpressionsparallel/'per.ə.lel平行的,并行series/'sɪr.iːz/串联[接]Tworesistorsinparallelinacircuit.Tworesistersconnectedinparallel.ResistorsR1and

6、R2areinseriesAnammetermeasurescurrentthroughacircuitelement;--thereforeitmustbeconnectedinserieswithit.Avoltmetermeasuresvoltageacrossacircuitelement;--thereforeitmustbeconnectedinparallelwithit.NewwordsandexpressionsAnammeterisconnectedinlinewiththecurrentpath.Avoltmeterisconnectedacrossthecu

7、rrentpath.Anohmmeterisconnectedacrossaresistor(theresistormustbeout-of-circuit).PMMCmeterscalibration/,kæl.ɪb‘reɪ.ʃən/n.刻度，标度scale(使)偏斜,(使)偏转indicatorpointerpermanentamovingcoilwithattachedindicatorthefieldofapermanentmagnet