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1、电工基础知识题库（BasicknowledgebaseofElectrotechnics）Thebasicchargeis1.units(Kulun).(106)aisequalto2.1amperes.3.auniformwirestretchedfor3timestheoriginallength,whiletheresistancetotheoriginal(9times).The4.generationofseriesresonantcondition(XL=Xc).Attheendofthe5.voltageno-loadlongHVtransmi
2、ssionlines(higherthanthebeginningvoltage).6.powerthree-phasesymmetricalload,whichisphasevoltageandlinecurrentThephaseanglebetween).7.whenthepowerfrequencyincreases,respectivelywithR,Lbulbseries,C3circuitinparallel,and(L)increasethebrightnessofthebulbseries.8.oftheratedvoltageis220V
3、thelightbulbinthe110Vpowersupply,lightingpoweristheoriginal(1/4).9.theratedvoltageofthesametworesistorsareconnectedinseriesinthecircuit,thebiggerresistancehighfever10.byusingtheprincipleofsuperpositioncalculationofcomplexcircuitisacomplexcircuitfor(singlepowersupply)circuitcalculat
4、ion.The11.circuitiscomposedofpowersupply,load,line,composition(switch).12.currentisformedbythedirectionalmovementofelectrons,positivecharge)onthehabitsofthedirectionalmovementdirectionasthedirectionofthecurrent.13,thecurrentsizeofthecurrentintensitytorepresentitsvalueisequaltothepe
5、runittimethroughtheconductorcrosssection.Power(charge)andalgebra.Theresistanceofthe14.conductor,andtheconductorsectionlengthnotonlyrelevant,butalsowiththeconductor(material).Thethreeelementsof15.alternatingcurrentisthemaximumfrequency(phase).16.sinusoidalalternatingcurrenteffective
6、valuesuchasmaximumvalue(0.7).17.resistanceresistancedoesnotchangewiththeappliedvoltageorcurrentsize(calledlinearresistance).Resistanceof18.resistancechangewiththeappliedvoltageorcurrentsize(callednonlinearresistor).19.twoparallelwiresbycurrentsinthesamedirection,betweentheconductor
7、(attraction).The20.conductorinthecurrent,moreclosetotheconductorsurface,the(currentislarger),thisphenomenoniscalledtheskineffect21.powerthree-phasestarconnectionorloadlinevoltageisthevoltage(3V)times,linecurrentandphasecurrent.]22.magneticinductioncurrentgeneratedbythe(stop)alwayst
8、rytochangeoriginalflux.23.
