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1、Chapter2CircuitSystemandDesignOutline2.1CircuitandSystem2.2AnalogandDigitalCircuitsDesign2.3RadioReceiverCircuit7/28/20211《通信与信息工程专业英语教程》2.1CircuitandSystemOutlineBasicconceptsCircuitandSystem7/28/20212《通信与信息工程专业英语教程》Terminologychargen.负荷,电荷,费用,主管,充电,充气,装料conductivityn.传导性
2、,传导率insulatorn.绝缘体,绝热器gravitationaladj.重力的voltagen.[电工]电压,伏特数voltsn.直流电压amperen.安培ohmn.[物]欧姆coulombn.[电]库仑(电量单位)diametern.直径inductancen.感应系数,自感应7/28/20213《通信与信息工程专业英语教程》dielectricn.电介质,绝缘体adj.非传导性的faradn.[电]法拉(电容单位)polarityn.极性potentialdifference[电]电位差，电势差equivalentresista
3、nce等效电阻SuperpositionTheorem叠加定理Thevenin'sTheorem戴维南定理Norton'sTheorem诺顿定理7/28/20214《通信与信息工程专业英语教程》IntheBohrtheoryoftheatom(namedafterNielsBohr,1885–1962),electronsorbitanucleuscontainingneutronsandprotons.Electricchargeismeasuredincoulombs.Thisrelativemobilityofelectronswit
4、hinamaterialisknownaselectricconductivity.Conductivityisdeterminedbythetypesofatomsinamaterial(thenumberofprotonsineachatom'snucleus,determiningitschemicalidentity)andhowtheatomsarelinkedtogetherwithoneanother.IntroductionTexttourBasicconceptsChargeandconductivity7/28/2021
5、5《通信与信息工程专业英语教程》Itshouldalsobeunderstoodthatsomematerialsexperiencechangesintheirelectricalpropertiesunderdifferentconditions.Whilethenormalmotionof"free"electronsinaconductorisrandom,withnoparticulardirectionorspeed,electronscanbeinfluencedtomoveinacoordinatedfashionthrou
6、ghaconductivematerial.Thisuniformmotionofelectronsiswhatwecallelectricity,orelectriccurrent.Therecanbeelectriccurrentonlywherethereexistsacontinuouspathofconductivematerialprovidingaconduitforelectronstotravelthrough.Ifthepathisblocked,the"flow"willnotoccur.7/28/20216《通信与信
7、息工程专业英语教程》Electriccircuits,voltageandcurrentAnelectriccircuitisformedwhenaconductivepathiscreatedtoallowfreeelectronstocontinuouslymove.Thiscontinuousmovementoffreeelectronsthroughtheconductorsofacircuitiscalledacurrent,anditisoftenreferredtointermsof"flow,"justliketheflow
8、ofaliquidthroughahollowpipe.Theforcemotivatingelectronsto"flow"inacircuitiscalledvoltage,
