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1、维修电工中级判断题对的（Intermediatequestionsformaintenanceelectrician）/////bulkimport/////answerAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
2、AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA/////Thewholecircuitincludesaninnercircuitandanoutercircuit.()/////WhenthecurrentequationofthenodeofKirchhoff'sdefinitelawisused,ifthecurrentisnegative,theactualcurrentdirectionisoppositetotheassumedcurrentdirection.()/////Th
3、enumericalexpressionforKirchhoff'slawofcurrentlawisasigmaI=SigmaIout.()/////AsshownintheDCcircuitshownbelow,knownasE1=15V,E2=70V,E3=5V,R1=6,R2=5,I5,R3=10,R4=2.5,R5=15,thebranchcurrentis2A.()/////MostcurrentThevenin'stheoremappliestoabranchforcomplexcircuitinthe.()/
4、////Inparallelwithacurrentsource,theinternalresistanceis2,andwhenthevoltagesourceisconvertedto10Vbyequivalent,thecurrentofthecurrentsourceis5A.()/////Asshowninthefollowingfigure,ifR1=0.2,R2=0.2,E1=7V,E2=6.2V,R3=3.2,thecurrentflowingthroughR3is2A.()/////ComplexDCcir
5、cuitsrefertocircuitsthatcannotbereducedtoseriesparallelcircuits.()/////Thenodevoltagemethodtakesthenodevoltageasanunknownquantity,andthenodevoltageequationislistedaccordingtoKirchhoff'scurrentlaw.()/////SinusoidalalternatingvoltageU=100sin(628t+60degrees)V,itsfrequ
6、encyis100Hz.()/////Insinusoidalquantities,expressedinvectorform,requiringthesamefrequencyincomputation.()/////Asshowninthefollowingdiagram,thesinusoidalalternatingcurrentanglefrequencyis3.14rad/s.()/////TheACvoltageattheendofacomponentisaheadofthecurrentflowingthro
7、ughit,andthecomponentisaninductiveload.()/////ThetotalcircuitimpedanceoftheRLseriescircuitisR+jL.()/////AtotaloftwoparallelimpedanceimpedancecircuitforZ=Z1Z2/Z1+Z2.()/////TheresonanceconditionofRLCparallelcircuitisL=1/C.()/////Whenthethree-phaseloadtriangleisconnec
8、ted,thephasevoltageoftheloadisequaltothelinevoltageofthepowersupply.()/////Inthethree-phasesymmetricalcircuitwithloadstarconnection,thephasecurre
