掌握专业外语技能是大学基础英语学习的主要目的之一，是一种素质上的提高，直接关系到学生的求职和毕业后的工作能力。专业外语重要性体现在多个方面，大到日益广泛的国际间的科学技术交流，小到对产品说明书的翻译。在INTERNET查找资料。专业外语具有与基础英语不同的特点和含义。专业英语的基本特点专业英语中的常用符号和数学式专业英语的翻译标准Unit1ElectricalNetworksUnit1ElectricalNetworksnetworkn.网络，电路resistorn.电阻器inductorn.电感器capacitorn.电容器passivenetwork无源网络activenetwork有源网络characteristicadj.特性(的)；n.特性曲线Ohmn.欧姆Faradayn.法拉第electriccharge电荷integraln.积分incrementn.增量armaturen.电枢，衔铁，加固aforementionedadj.上述的，前面提到的Anelectricalcircuitornetworkiscomposedofelementssuchasresistors,inductors,andcapacitorsconnectedtogetherinsomemanner.Ifthenetworkcontainsnoenergysources,suchasbatteriesorelectricalgenerators,itisknownasapassivenetwork.Ontheotherhand,ifoneormoreenergysourcesarepresent,theresultantcombinationisanactivenetwork.Instudyingthebehaviorofanelectricalnetwork,weareinterestedindeterminingthevoltagesandcurrentsthatexistwithinthecircuit.Sinceanetworkiscomposedofpassivecircuitelements,wemustfirstdefinetheelectricalcharacteristicoftheseelements.Inthecaseofaresistor,thevoltage-currentrelationshipisgivenbyOhm’slaw,whichstatesthatthevoltageacrosstheresistorisequaltothecurrentthroughtheresistormultipliedbythevalueoftheresistance.Mathematically,thisisexpressedasu=iRwhereu=voltage,V;i=current,A;R=resistance,ThevoltageacrossapureinductorisdefinedbyFaraday’slaw,witchstatesthatthevoltageacrosstheinductorisproportionaltotherateofchangewithtimeofthecurrentthroughtheinductor.Thuswehavewheredi/dt=rateofchangeofcurrent,A/s;L=inductance,H.Thevoltagedevelopedacrossacapacitorisproportionaltotheelectricchargeqaccumulatingontheplatesofthecapacitor.Sincetheaccumulationofchargemaybeexpressedasthesummation,orintegral,ofthechargeincrementsdq,wehavetheequationwherethecapacitanceCistheproportionalityconstantrelatingvoltageandcharge.Bydefinition,currentequalsrateofchangeofchargewithtimeandisexpressedasi=dq/dt.Thusanincrementofchargedqisequaltothecurrentmultipliedbythecorrespondingtimeincrement,ordq=idt.Eq.(1-1A-3)maythenbewrittenaswhereC=capacitance,F.