资源描述：
《维修电工中级判断题对的（the maintenance electrician intermediate judgment is correct）》由会员上传分享，免费在线阅读，更多相关内容在教育资源-天天文库。
1、维修电工中级判断题对的（Themaintenanceelectricianintermediatejudgmentiscorrect）/////batchimport/////theanswerAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
2、AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA/////Fullcircuitincludesinternalcircuitandexternalcircuit.(a)/////Whenthecurrentequationisshowninthefirstlawofkirchhoff'sfirstlaw,ifthecurrentisnegative,theactualcurrentdirectionisinthe
3、oppositedirectiontotheassumedcurrent.(a)/////Thedigitalexpressionofkirchhoff'slawofelectriccurrentisthesumofsigmaI.(a)/////Inthedirectcurrentpathshownbelow,E1=15V,E2=70V,E3=5V,R1=6,R2=5,R3=10,R4=2.5,R5=15,andthebranchcurrentI5is2A.(a)/////TheDavidsout
4、htheoremisbestsuitedforfindingthecurrentofabranchinacomplexcircuit.(a)/////Inparallelwithancurrentsource,theinternalresistanceis2.Whenthevoltagesourceistransformedto10V,thecurrentofthecurrentsourceis5A.(a)/////Asshowninthefigurebelow,ifR1=0.2R2=0.2,E1
5、=7V,E2=6.2,R3=3.2,thenthecurrentinR3is2A.(a)/////Complexdirectcurrentcircuitisnotacircuitthatcanbesimplifiedasaseriesparallel.(a)/////Thenodevoltagemethodistheunknownquantityofthenodevoltage,andthevoltageequationofthenodeislistedaccordingtokirchhoff's
6、currentlaw.(a)/////ThesinusoidalacvoltageU=100sin(628t+60°)V,itsfrequencyis100hz.(a)/////Thesinusoidalquantityisexpressedinvectorform,andthefrequencyisthesameatthetimeofcalculation.(a)/////Thesinusoidalacangularfrequencyshowninthefollowingfigureis3.14
7、rad/s.(a)/////Theacvoltageatbothendsofacomponentisaheadofthecurrentflowingthroughit,andthecomponentisaperceptualload.(a)/////CircuittotalimpedanceofRLseriescircuitisR+jL.(a)/////ThetotalimpedanceoftwocircuitswithtwoimpedanceparallelisZ=Z1Z2/Z1+Z2.(a)/
8、////TheresonanceconditionoftheRLCparallelcircuitisL=1/C.(a)/////Whenathree-phaseloadtriangleisconnected,thephasevoltageoftheloadisequaltothelinevoltageofthepowersupply.(a)/////Inthethree-phasesymmetriccircuitoftheloadstarconnection,thephaseoft
