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首页 专业英语-学习指南 一. 根据下面的英文解释,写出相应的英文词汇。 1 ..&…

专业英语-学习指南 一. 根据下面的英文解释,写出相应的英文词汇。 1 ....doc

专业英语-学习指南 一. 根据下面的英文解释,写出相应的英文词…

上传者: 王天旭 2017-12-08 评分 4.5 0 75 10 342 暂无简介 简介 举报

简介:本文档为《专业英语-学习指南 一. 根据下面的英文解释,写出相应的英文词汇。 1 ...doc》,可适用于战略管理领域,主题内容包含专业英语学习指南一.根据下面的英文解释写出相应的英文词汇。专业英语学习指南一(根据下面的英文解释写出相应的英文词汇。thatisamaterialo符等。

专业英语学习指南一.根据下面的英文解释写出相应的英文词汇。专业英语学习指南一(根据下面的英文解释写出相应的英文词汇。thatisamaterialorcoveringwhichelectricity,heatorsoundcannotgothroughthatallowelectricityorheattogothroughthestandardunitofmeasurementforthestrengthofanelectricalcurrentoforrelatingtomagnetismormagnetsaunitofpotentialdifferenceequaltoonethousandthofavoltanumberwrittenusingthebasenumericalsomething,suchasamachineoranengine,thatproducesorimpartsmotiontheactofdisturbinganintegratedcircuitthatcontainstheentirecentralprocessingunitofacomputeronasinglechipaprocedureforsolvingaproblemthatinvolvescollectionofdata,processing,andpresentationofresultsthestandardmeasureofelectricalpoweranelectricgeneratorthatproducesalternatingcurrenttwopiecesofwirewereconnectedendtoendtwopiecesofwirewereconnectedsidebysidethestandardunitofmeasurementforstrengthofanelectricalcurrentadeviceusedtobreakoropenanelectriccircuitortodivertcurrentfromoneconductortoanotheradevicethatgenerateslight,heat,ortherapeuticradiationamaterialthatinsulates,especiallyanonconductorofsound,heat,orelectricityoforrelatingtoasystemofnumerationhavingasitsbasethestandardunitofelectricalresistanceanumberwrittenusingthebasenumericalsomething,suchasamachineoranengine,thatproducesorimpartsmotiontheactofdisturbinganintegratedcircuitthatcontainstheentirecentralprocessingunitofacomputeronasinglechipaprocedureforsolvingaproblemthatinvolvescollectionofdata,processing,andpresentationofresultsthatisamaterialorcoveringwhichelectricity,heatorsoundcannotgothroughthatallowelectricityorheattogothroughthestandardunitofmeasurementforthestrengthofanelectricalcurrentoforrelatingtomagnetismormagnetsaunitofpotentialdifferenceequaltoonethousandthofavolt根据电气工程专业基本知识判断正误。二PIDcontrollerisaveryusefulcontrollerinindustryAdigitalcomputercontrolledsystemisonlydesignedfordiscretevariableMostprogrammerstodayprefertousehighlevellanguages,suchasC,Java,COBOL,andVisualBasicAnoutputdevice,suchasakeyboardormouse,gathersinputandtransformsitintoaseriesofelectronicsignalsforthecomputerWhenthreecapacitorsconnectedinparallel,ElectronwillflowthroughaconductorfromthepositiveterminaltothenegativeterminalForexample,iftheeffectivevalueisV,thepeakvalueisVIfaconductorcutsthroughlinesofflux,thevoltageintheconductoriscausedWheneveraconductorcutsthroughlinesoffluxavoltageisinducedintheconductorThevoltageisCEMF(CounterElectromotiveForce)InChinaalternatingcurrentisusuallygeneratedatHzInalternatingcurrentanACgeneratorisusedtomakeelectronsflowcontinuouslyinonedirectionInNorthAmericanHzisadoptedasstandardfrequencyinelectricpowersystemAcomputer’smicroprocessoronlyunderstandshighlevellanguageInstructionswritteninahighlevellanguagemustbetranslatedintomachinelanguageinbinaryformbeforeacomputercanusethemInalternatingcurrentanACgeneratorisusedtomakeelectronsflowcontinuouslyinonedirectionInChinaalternatingcurrentisusuallygeneratedatHzThenorthpoleofthearmatureisattractedtothesouthpoleofthemainfieldThesouthpoleofthearmatureisattractedtothenorthpoleofthemainfieldWhenthreecapacitorsconnectedinseries,CCCC,totalThecommutatorcanchangecurrentdirectionintheconductorMostcomputersareequippedwithakeyboardastheprimaryoutputdeviceElectronwillflowthroughaconductorfromthepositiveterminaltothenegativeterminalForexample,iftheeffectivevalueisV,thepeakvalueisVIfaconductorcutsthroughlinesofflux,thevoltageintheconductoriscausedWheneveraconductorcutsthroughlinesoffluxavoltageisinducedintheconductorThevoltageisCEMF(CounterElectromotiveForce)PIDcontrollerisaveryusefulcontrollerinindustryAdigitalcomputercontrolledsystemisonlydesignedfordiscretevariableMostprogrammerstodayprefertousehighlevellanguages,suchasC,Java,COBOL,andVisualBasicAnoutputdevice,suchasakeyboardormouse,gathersinputandtransformsitintoaseriesofelectronicsignalsforthecomputerWhenthreecapacitorsconnectedinparallel,CCCC,,,totalnInChinaalternatingcurrentisusuallygeneratedatHz三基本词汇的英汉互译。电能转换器loadresistance理想电压源internalresistance转子semiconductor运算放大器distributedwinding同步发电机reactivepowercompensationratedarmaturecurrent理想电源circuitparameters周期电流negativefeedback直轴有功电流分量reactivecurrentcurrent电网digitalrelays运算放大器distributedwinding同步发电机reactivepowercompensation电能转换器loadresistance理想电压源internalresistance转子semiconductor四根据电气工程基本知识完成填空。ResistorsareelementsApassiveBactiveCindependentsourcesDdependentsourcesAnelectricheaterdrawsAfromaVlineTheresistanceoftheheaterisABCDThealgebraicsumofallvoltagesaroundaloopisAzeroBindefinitevalueCsumofvoltagerisesDsumofvoltagedropsONOFFinformationcanberepresentedbysignalAadigitalBananalogCadiscreteDacontrolTheprocessquantizingthecontinuousvaluesintoabinaryscaleiscalledAdigitaltoanalogconversionBdigitaltodigitalconversionCanalogtodigitalconversionDanalogtoanalogconversionThewideapplicationofoperationalamplifiersliesinadvantageofusingApositivefeedbacknetworksBlargeopencircuitgainCnegativefeedbacknetworksDsmalloutputimpedanceWhenaninductionmotorwithpolesissuppliedbyHzthreephaseacpowersource,thesynchronousrevolutionsperminuteis(Synchronousrmin=fp)ABCDTheelectricmachinethatoperatesatspeedsabovesynchronousspeedworksinregionAmotoringBgeneratingCpluggingDstoppingAtransformerisadevicethatcanconvertoneacvoltagetoanotheracvoltagethroughtheactionofAanelectriccircuitBamagneticfieldCanelectricfieldDacouplingcircuitTheprimarywindingisconnectedtoAthepowersourceBtheloadCthemeasurementinstrumentDthemotorCopperlossesarelossesintheprimaryandsecondarywindingsofthetransformercoreAinductiveBcapacitiveCresistiveDreactivecanprovideanasynchronouslinkbetweentwoacelectricpowersystemwithdifferentnominalfrequenciesATheHVDC(highvoltageDC)transmissionBTheEHV(extrahighvoltage)ACtransmissionCTheACdistributionDGeneratorsThegeneratorvoltagesareusuallysteppeduptothetransmissionvoltagelevelbyAseriescapacitorBparallelreactorsCstepuptransformersDstepdowntransformersTheobjectiveoftheoptimaleconomicoperationofpowersystemsisAtominimizethetotalproductioncostBtomaintainfrequencyconstantCtomaintainvoltagesconstantDtoensurebalancebetweengenerationandloadAnyprotectionschemeconsistsbasicallyofAtwoelementsBthreeelementsCfourelementsDfiveelementsTheprotectiveschemethatsenseszerosequencecurrentandoperatesasnecessaryiscalledasAovercurrentprotectionBzerosequenceprotectionCnegativesequenceprotectionDdirectionalprotectionThedistanceprotectionisappliedtoprotectAtransformersBgeneratorsCtransmissionlinesDbusesThethermalenergyofthesteamisconvertedintoenergybytheturbineAelectricalBmechanicalCchemicalDpotentialisusedascoolantinlightwaterreactorsAGasBOrganiccompoundCMoltensaltDWaterIntheformoftheoutputiscontinuouslyfedbackandcomparedwiththereferenceinputAcontinuouscontrolBdiscontinuouscontrolCdiscretedatacontrolDsampleddatacontrolTheoveralltransferfunctionistheratioofthetransformofthecontrolledvariabletothetransformofAthecontrolledvariableBthereferenceinputCthefeedbackDtheoutputvariableThesystem’scharacteristicequationcanbeusedtodetermineofalineartimeinvariantsystemAthestabilityBmagnitudeofthesteadystateerrorCthecontrollabilityDtheobservabilityIntherootlocusmethodtheactualtimeresponseofasystemcanbeobtainedbymeansofAtheinverseFouriertransformBtheinverseLaplacetransformCtheFouriertransformDtheLaplacetransformTheBuck(降压式变换器)isaconverterAvoltagestepupBcurrentstepdownCcurrentstepupDresistanceMostdesktopcomputersuseaseparateasadisplaydevice,wherenotebookcomputersuseaflatpanelLCDscreen(liquidcrystaldisplayscreen)thatattachedtothesystemunitAkeyboardBMouseCMonitorDharddiskAdesktopcomputer’ssoundcardsendssignalstoexternalAprinterBspeakerCModemDkeyboardDatastoredinRAMwhenthepowerofthecomputeristurnedoffAisheldpermanentlyBpermanentlydisappearsCisheldtemporarilyDtemporarilydisappearsThenotebookcomputersuseasstandarddisplayequipmentACRTdisplayBLCDsCLEDDTVscreenImageclarityonacomputerscreenismeasuredwithAscreensizeBdotpitchCresolutionDcolordepththatconnectsatleasttwonetworksmakesdecisionaboutthebestroutefordataAAmodemBAnetworkcardCAhubDArouter(路由器)ResistorsareelementsApassiveBactiveCindependentsourcesDdependentsourcesAnelectricheaterdrawsAfromaVlineTheresistanceoftheheaterisABCDThealgebraicsumofallvoltagesaroundaloopisAzeroBindefinitevalueCsumofvoltagerisesDsumofvoltagedropsONOFFinformationcanberepresentedbysignalAadigitalBananalogCadiscreteDacontrolInNorthAmericanisadoptedasstandardfrequencyinelectricpowersystemAHzBHzCHzDHzcanprovideanasynchronouslinkbetweentwoacelectricpowersystemwithdifferentnominalfrequenciesATheHVDC(highvoltageDC)transmissionBTheEHV(extrahighvoltage)ACtransmissionCTheACdistributionDGeneratorsThegeneratorvoltagesareusuallysteppeduptothetransmissionvoltagelevelbyAseriescapacitorBparallelreactorsuptransformersDstepdowntransformersCstepADAisadevicethatcanconvertadigitalsignaltotheequivalentAdigitalformBnumericalformCbinaryformDanalogformTheprecisionofADC(analogtodigitalconversion)isdeterminedbyAitsspeedBitsgainCtheaccuracyofthereferencevoltageDthenumberofbinarybitsWhenaninductionmotorwithpolesissuppliedbyHzthreephaseacpowersource,thesynchronousrevolutionsperminuteis(Synchronousrmin=fp)ABCDAcomputerprinterisdevicethatproducescomputergeneratedtextorgraphicalimagesonpaperAaninputBanoutputCastorageDadataprocessingcarriesdataouttospeakersandheadphones,orbackfromamicrophoneAAgraphicscardBAmodemCAnetworkcardDAsoundcardAcomputer’smicroprocessoronlyunderstandsinbinaryformAhighlevellanguagesBmachinelanguageChumanlanguagesDassemblylanguageDelphibelongstoAlowlevelprogramminglanguageBhighlevelprogramminglanguageCaprogramminglanguageconnectedwiththecomputerhardwarebehaviorDanassemblylanguageAfloppydiskdriveisdevicethatreadsdatafromandwritesdatatofloppydisksAaninputBanoutputCastorageDadataprocessingInacoalfiredpowerplant,anelectrostaticprecipitatorisusedtoremovefromthecombustiongasesAsolidparticleBCCODwatervapourSOIncogeneration(热电联产热电联供)systems,theoverallenergyefficienciesareraisedbyAimportantthecombustionprocessBprovidingthermalenergytothecustomersCraisingthesteamtemperatureDreducingemissionsSOThehydropoweriswellsuitedforswitchingaccordingtocommandtomeetchangingpowerneedsAaconsumer’sBauser’sCadispatcher’sDanoperator’sGsGsThetotaltransferfunctionforandincascadeisGsGsGsGsGsGsABCDThesystem’scharacteristicequationcanbeusedtodetermineofalineartimeinvariantsystemAthestabilityBmagnitudeofthesteadystateerrorCthecontrollabilityDtheobservabilityTheBuck(降压式变换器)isaconverterAvoltagestepupBcurrentstepdownCcurrentstepupDresistanceAfrequencyresponseisafunctionofthevariableDtsABCDj,TheunitoflogarithmofthemagnitudeofatransferfunctionisAradianspersecondBvoltsCdecibelDoctavesTheDCDCconvertsinputtooutputAdirectcurrent,alternatingcurrentBdirectcurrent,directcurrentCalternatingcurrent,alternatingcurrentDalternatingcurrent,alternatingcurrentTheprimarywindingisconnectedtoAthepowersourceBtheloadCthemeasurementinstrumentDthemotorCopperlossesarelossesintheprimaryandsecondarywindingsofthetransformercoreAinductiveBcapacitiveCresistiveDreactiveTherelationresultsinAAABidentityCindefinitevalueDzeroThenotebookcomputersuseasstandarddisplayequipmentACRTdisplayBLCDsCLEDDTVscreenAnexpansionslotisalong,narrowsocketonthemotherboardintowhichyoucanplugAanexpansioncardBamodemCanetworkcardDasoundcardsCurrentDKirchhoff’sVoltageCKirchhoff’ThetransformerisastraightforwardapplicationofFaraday’sLawAOhm’sBElectromagneticInductionCKirchhoff’sCurrentDKirchhoff’sVoltageThealgebraicsumofallvoltagesaroundaloopisAzeroBindefinitevalueCsumofvoltagerisesDsumofvoltagedropsONOFFinformationcanberepresentedbysignalAadigitalBananalogCadiscreteDacontrolResistorsareelementsApassiveBactiveCindependentsourcesDdependentsourcesAnelectricheaterdrawsAfromaVlineTheresistanceoftheheaterisABCDAtransformerisadevicethatcanconvertoneacvoltagetoanotheracvoltagethroughtheactionofAanelectriccircuitBamagneticfieldCanelectricfieldDacouplingcircuitTheprimarywindingisconnectedtoAthepowersourceBtheloadCthemeasurementinstrumentDthemotorCopperlossesarelossesintheprimaryandsecondarywindingsofthetransformercoreAinductiveBcapacitiveCresistiveDreactivecanprovideanasynchronouslinkbetweentwoacelectricpowersystemwithdifferentnominalfrequenciesATheHVDC(highvoltageDC)transmissionBTheEHV(extrahighvoltage)ACtransmissionCTheACdistributionDGeneratorsThegeneratorvoltagesareusuallysteppeduptothetransmissionvoltagelevelbyAseriescapacitorBparallelreactorsCstepuptransformersDstepdowntransformersTheprocessquantizingthecontinuousvaluesintoabinaryscaleiscalledAdigitaltoanalogconversionBdigitaltodigitalconversionCanalogtodigitalconversionDanalogtoanalogconversionThewideapplicationofoperationalamplifiersliesinadvantageofusingApositivefeedbacknetworksBlargeopencircuitgainCnegativefeedbacknetworksDsmalloutputimpedanceWhenaninductionmotorwithpolesissuppliedbyHzthreephaseacpowersource,thesynchronousrevolutionsperminuteis(Synchronousrmin=fp)ABCDTheelectricmachinethatoperatesatspeedsabovesynchronousspeedworksinregionAmotoringBgeneratingCpluggingDstoppingThethermalenergyofthesteamisconvertedintoenergybytheturbineAelectricalBmechanicalCchemicalDpotentialisusedascoolantinlightwaterreactorsAGasBOrganiccompoundCMoltensaltDWaterIntheformoftheoutputiscontinuouslyfedbackandcomparedwiththereferenceinputAcontinuouscontrolBdiscontinuouscontrolCdiscretedatacontrolDsampleddatacontrolTheoveralltransferfunctionistheratioofthetransformofthecontrolledvariabletothetransformofAthecontrolledvariableBthereferenceinputCthefeedbackDtheoutputvariableThesystem’scharacteristicequationcanbeusedtodetermineofalineartimeinvariantsystemAthestabilityBmagnitudeofthesteadystateerrorCthecontrollabilityDtheobservabilityIntherootlocusmethodtheactualtimeresponseofasystemcanbeobtainedbymeansofAtheinverseFouriertransformBtheinverseLaplacetransformCtheFouriertransformDtheLaplacetransformTheobjectiveoftheoptimaleconomicoperationofpowersystemsisAtominimizethetotalproductioncostBtomaintainfrequencyconstantCtomaintainvoltagesconstantDtoensurebalancebetweengenerationandloadAnyprotectionschemeconsistsbasicallyofAtwoelementsBthreeelementsCfourelementsDfiveelementsTheprotectiveschemethatsenseszerosequencecurrentandoperatesasnecessaryiscalledasAovercurrentprotectionBzerosequenceprotectionDdirectionalprotectionCnegativesequenceprotectionThedistanceprotectionisappliedtoprotectAtransformersBgeneratorsCtransmissionlinesDbusesThenotebookcomputersuseasstandarddisplayequipmentACRTdisplayBLCDsCLEDDTVscreenImageclarityonacomputerscreenismeasuredwithAscreensizeBdotpitchCresolutionDcolordepththatconnectsatleasttwonetworksmakesdecisionaboutthebestroutefordataAAmodemBAnetworkcardCAhubDArouter(路由器)TheBuck(降压式变换器)isaconverterAvoltagestepupBcurrentstepdownCcurrentstepupDresistanceMostdesktopcomputersuseaseparateasadisplaydevice,wherenotebookcomputersuseaflatpanelLCDscreen(liquidcrystaldisplayscreen)thatattachedtothesystemunitAkeyboardBMouseCMonitorDharddiskAdesktopcomputer’ssoundcardsendssignalstoexternalAprinterBspeakerCModemDkeyboardDatastoredinRAMwhenthepowerofthecomputeristurnedoffAisheldpermanentlyBpermanentlydisappearsCisheldtemporarilyDtemporarilydisappears五将下列短文翻译为中文。Althoughthedirectcurrentisuseful,ithasonegreatdisadvantage,thatis,thereisnoeasy,economicalwaytoincreaseordecreaseitsvoltageThealternatingcurrenthasnotthisdisadvantageUsingaspecialdevice,itispossibletotransformahighvoltageintoalowvoltageoralowvoltageintoahighvoltageThedevicethatweusetotransformthevoltageiscalledatransformerThealternatingcurrentcanalsobechangedeasilyintothedirectcurrentThedevicewhichcandothisisspokenofasarectifierNoiseisprobablytheonlytopicinelectronicsandtelecommunicationwithwhicheveryonemustbefamiliar,nomatterwhathisorherspecializationItiseverpresent,andlimitstheperformanceofvirtuallyeverysystemAlso,themeasurementofitisverycontentious,withalmosteverybodyhavingadifferentpetmethodofquantifyingitanditseffectsThecoiltowhichthevoltageisappliedisknownastheprimary,whiletheonefromwhichtheinducedvoltageisobtainedisknownasthesecondaryIfthesecondaryhasmoreturnsthantheprimary,thetransformeriscalledastepuptransformerinwhichtheACvoltageofthesecondarywindingishigherthanthatappliedtotheprimarywindingIfthesecondaryhasfewerturnsthantheprimary,thetransformeriscalledastepdowntransformerinwhichtheACvoltageofthesecondarywindingislowerthanthatappliedtotheprimarywindingInawellbuilttransformertheproductofthesecondaryvoltagemultipliedbythesecondarycurrentisalmostequaltotheproductoftheprimaryvoltagetimestheprimarycurrentNoiseisprobablytheonlytopicinelectronicsandtelecommunicationwithwhicheveryonemustbefamiliar,nomatterwhathisorherspecializationItiseverpresent,andlimitstheperformanceofvirtuallyeverysystemAlso,themeasurementofitisverycontentious,withalmosteverybodyhavingadifferentpetmethodofquantifyingitanditseffectsTherearetwokindsofcurrent:directcurrent(DC)andalternatingcurrent(AC)AdirectcurrentisacurrentflowinginaconductoralwaysinonedirectionAnalternatingcurrentisacurrentperiodicallychangingitsdirectionofflowTheelectriccurrenttransmittedthroughelectricpowerlinesisalternatingcurrentThisisbecauseACiseasytocontrolandmoreeconomicalwhenwetransmititoverlongdistancesByanelectriccircuitornetworkwemeanacollectionofelectricaldevices(forexample,voltageandcurrentsources,resistors,inductors,capacitors,transformers,amplifiers,andtransistors)thatareinterconnectedinsomemannerThevarioususesofsuchcircuits,thoughimportant,isnotthemajorconcernofthistextInstead,ourprimeinterestwillbewiththeprocessofdeterminingthebehaviorofagivencircuitwhichisreferredtoasanalysis六将下列句子翻译为英文。同性电荷相斥异性电荷相吸。电力可通过远距离传输到用户。如果开关接通电流就流过线路。通常用字母E表示电动势。电磁波传播的速度和光一样。我们将大规模发展电力工业。这台发动机一直运转良好。电流在电路中流动的速度是非常快的。如果使用变压器低电压的电力就能转换成高电压的电力。这一现象我们称之为电磁感应。我们把这些物质称为导体。有两种不同的电荷:正电荷和负电荷。电流会使导线发热。电使得收音机工作。铜允许电流容易地流过它。答案一insulatorconductoramperemagneticmillivoltdecimalmotordisturbancemicroprocessorprogramwattagealternator(ACgenerator)inseriesinparallelAmpereswitchlampinsulatorbinaryOhmdecimalmotordisturbancemicroprocessorprograminsulatorconductoramperemagneticmillivolt二TFTFFTFTTFFFFTFFTFTFTFTTTFTFFF三energyconverter负载电阻idealvoltagesource内阻rotor半导体operationalamplifiersynchronousgenerators无功补偿器分布绕组额定电枢电流idealsource电路参数periodiccurrent负反馈directaxisactivecurrentcomponent无功电流分量powernetworks数字继电器operationalamplifier分布绕组synchronousgeneratorsenergyconverter负载电阻无功补偿器idealvoltagesource内阻rotor半导体四ACAACCDBBACACAABCBDABABCCBBBBDACAACACDDDBDBBCABCCACBCBACBBABAAACBACACCCDBBDABABAABCBBDCCBB五虽然直流电是有用的但它有一个突出的缺点也就是没有简单而经济的方法来提高或降低它的电压。而交流电则没有这一缺点。如果使用一种专门的设备我们就能够把高压变成低压或把低压变成高压。我们用来改变电压的这种设备叫做变压器。交流电也能容易地被改变成直流电。能够做到这一点的器件就称为整流器。噪声也许是电子学和电讯工程中每个人必须熟悉的唯一论题而不管其专业是什么。噪声总是存在的它限制了事实上每个系统的性能。同时对噪声的测量是十分有争议的几乎每个人都有一种对噪声及其效应进行量化的不同的最得意的方法。外加有电压的线圈被称为初级而从中获得感应电压的线圈被称为次级。如果次级的匝数比初级多则变压器就称为升压变压器在这种变压器中次级绕组的交变电压高于加给初级绕组的电压。如果次级的匝数少于初级则变压器称为降压变压器在这种变压器中次级绕组的交变电压低于加给初级绕组的电压。在绕制得很好的变压器中次级电压乘以次级电流的乘积几乎等于初级电压乘以初级电流的乘积。噪声也许是电子学和电讯工程中每个人必须熟悉的唯一论题而不管其专业是什么。噪声总是存在的它限制了事实上每个系统的性能。同时对噪声的测量是十分有争议的几乎每个人都有一种对噪声及其效应进行量化的不同的最得意的方法。电流有两种:一种是直流电(DC)一种是交流电(AC)。直流电是在导体中总是朝一个方向流动的电流。交流电则是周期性地改变其流动方向的一种电流。通过输电线输送的是电流是交流电这是因为交流电易于控制且当我们把它输送到远方时比较经济。所谓电路或网络我们指的是一堆按某种方式相互连接在一起的电器件(例如电压源和电流源、电阻器、电感器、电容器、变压器、放大器和晶体管)。这种电路的各种用途虽然重要但并不是本书主要关心的事。而我们的主要兴趣将是在确定某一特定电路的性能这一过程(这称为“分析”)方面。六Likechargesrepel,unlikechargesattractElectricpowercanbetransmittedoverlongdistancetousersTheelectriccurrentflowsthroughthecircuitwiththeswitchonTheletterEiscommonlyusedforelectromotiveforceElectromagneticwavestravelasfastaslightWeshalldeveloptheelectricpowerindustryinawayTheenginehasgivenaconstantlygoodperformanceThespeedatwhichcurrentflowsincircuitisverygreatUsingatransformer,poweratlowvoltagecanbetransformedintopowerathighvoltageThisphenomenonwecallelectromagneticinductionWecallthesesubstancesconductorsTherearetwodifferentkindsofelectriccharges:positivechargesandnegativechargesThecurrentcanmakethewirehotElectricitymakesaradioplayCopperletstheelectriccurrentfloweasilythroughit

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