Lesson 15 Ohms Law 电子技术专业英语教程

Lesson15Ohm'sLaw《电子技术专业英语教程》冯新宇主编电子工业出版社《电子技术专业英语教程》2Lesson15Ohm'sLaw•Backgrounds•Texttour•Languageinuse–VocabularyStructure–Reading/writingtechniques2020/5/18《电子技术专业英语教程》3•Terminology–currentdensity•Coulomb'slaw•Ampère'scircuitallawBackgrounds2020/5/18《电子技术专业英语教程》4Terminology2020/5/18《电子技术专业英语教程》5Currentdensity•Currentdensityisameasureofthedensityofflowofaconservedcharge.Usuallythechargeistheelectriccharge,inwhichcasetheassociatedcurrentdensityistheelectriccurrentperunitareaofcrosssection,butthetermcurrentdensitycanalsobeappliedtootherconservedquantities.Itisdefinedasavectorwhosemagnitudeisthecurrentpercross-sectionalarea.InSIunits,theelectriccurrentdensityismeasuredinamperespersquaremetre.2020/5/18《电子技术专业英语教程》6Coulomb'slaw•Coulomb'slaw,sometimescalledtheCoulomblaw,isanequationdescribingtheelectrostaticforcebetweenelectriccharges.Itwasdevelopedinthe1780sbyFrenchphysicistCharlesAugustindeCoulombandwasessentialtothedevelopmentofthetheoryofelectromagnetism.2020/5/18《电子技术专业英语教程》7Ampère'scircuitallaw•Inclassicalelectromagnetism,Ampère'scircuitallaw,discoveredbyAndré-MarieAmpèrein1826,relatestheintegratedmagneticfieldaroundaclosedlooptotheelectriccurrentpassingthroughtheloop.2020/5/18《电子技术专业英语教程》8Ampère'scircuitallaw•Maxwellderiveditagainelectrodynamicallyinhis1861paperOnPhysicalLinesofForceanditisnowoneoftheMaxwellequations,whichformthebasisofclassicalelectromagnetism.2020/5/18《电子技术专业英语教程》9•Outline–Briefintroduction(para.1)–ThediscoveryofOhm'slaw(para.2)–TheequationofOhm'slaw(para.3-9)–Temperatureeffects(para.10)–Applicationtocircuitanalysis(para.11-16)–TransientsandACcircuits(para.17-23)Texttour2020/5/18《电子技术专业英语教程》10•electriccurrentisproportionaltoapotentialdifference•firstdiscoveredbyHenryCavendish•OhmpublishedthelawThediscoveryofOhm'slaw2020/5/18《电子技术专业英语教程》11•voltage,currentandresistanceareinterrelatedonamacroscopiclevel•themathematicalequationis•PhysicistsoftenusethecontinuumformofOhm'sLaw:TheequationofOhm'slawRVIEJ2020/5/18《电子技术专业英语教程》12•resistancewillusuallyincreaseastemperature•Theresistanceofanohmicsubstancedependsontemperatureinthefollowingway:•exceptionissemiconductorsTemperatureeffects100TTRR2020/5/18《电子技术专业英语教程》13Applicationtocircuitanalysis•Resistorsinseries•ResistorsinparallelntotalRRRR211211111ntotalRRRR2020/5/18《电子技术专业英语教程》14•Vocabularycontinuum，framework,terminalStructureLanguageinuse2020/5/18《电子技术专业英语教程》15Vocabulary2020/5/18《电子技术专业英语教程》16•acontinuousseriesorwhole,nopartofwhichisperceptiblydifferentfromtheadjacentpartscontinuumindictionary2020/5/18《电子技术专业英语教程》17continuumintext•PhysicistsoftenusethecontinuumformofOhm'sLaw:whereJisthecurrentdensity(currentperunitarea,unlikethesimplerI,unitsofamperes,ofOhm'slaw),σistheconductivityandEistheelectricfield(unitsofvoltspermeter,unlikethesimplerV,unitsofvolts,ofOhm'slaw).EJ2020/5/18《电子技术专业英语教程》18continuumintext•物理学家通常使用欧姆定律的连续形式：，其中J是电流密度（即每单位面积上的电流，而不是欧姆定律中简单的I，单位是安培），σ是电导率，E是电场（单位为伏特/米，而不是欧姆定律中简单的V，单位为伏特）。2020/5/18《电子技术专业英语教程》19•continuumstructure连续体结构•continuumspectrum连续谱•homogeneouscontinuum各向同性连续介质•applicationcontinuum应用一体化•continuumlimit连续极限•equivalentcontinuum等效连续介质•continuummodel连续介质模型continuuminuse2020/5/18《电子技术专业英语教程》20•astructuralplanorbasisofaproject•astructureorframesupportingorcontainingsomething•framescollectively•worksuchasembroideryorweavingdoneinoronaframeframeworkindictionary2020/5/18《电子技术专业英语教程》21•AdetailedstudyoftheconceptualframeworkusedbyOhminformulatingOhm'slawhasbeenpresentedbyArchibald.•欧姆在欧姆定律中所构想的精确理论框架，最后由阿奇博尔德提出。frameworkintext2020/5/18《电子技术专业英语教程》22•cooperationframework合作范式•macroscopicframework总体框架•frameworktest框架测试•budgetframework预算框架•circuitframework电路结构•frameworkfeature结构特征•designingframework设计框架frameworkinuse2020/5/18《电子技术专业英语教程》23adj•of,being,orsituatedatanend,terminus,orboundary•of,relatingto,oroccurringafterorinaterm•(ofadisease)terminatingindeath•extreme•oforrelatingtothestorageordeliveryoffreightatawarehouseterminalindictionary2020/5/18《电子技术专业英语教程》24terminalindictionaryn•aterminatingpoint,part,orplace•apointatwhichcurrententersorleavesanelectricaldevice,suchasabatteryoracircuit.aconductorbywhichcurrententersorleavesatsuchapoint•adevicehavinginput/outputlinkswithacomputerbutsituatedatadistancefromthecomputer2020/5/18《电子技术专业英语教程》25terminalindictionary•anornamentalcarvingattheendofastructure.anothernameforterm•apointorstationusuallyattheendofthelineofarailway,servingasanimportantaccesspointforpassengersorfreight.alesscommonnameforterminus•apurpose-builtreceptionanddeparturestructureattheterminusofabus,sea,orairtransportroute2020/5/18《电子技术专业英语教程》26terminalindictionary•asitewhererawmaterialisunloaded,stored,insomecasesreprocessed,andreloadedforfurthertransportation,espanonshoreinstallationdesignedtoreceiveoffshoreoilorgasfromtankersorapipeline•thesmallestarteriolebeforeitsdivisionintocapillaries.eitheroftwoveinsthatcollectbloodfromthethalamusandsurroundingstructuresandemptyitintotheinternalcerebralvein.theportionofabronchiolejustbeforeitsubdivid