《电路基础》样卷-答案(学习).doc

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1、Solvethefollowingproblems.(100points)1、(6points)FindUabinthecircuitinFigure1.Solution:Uab=9V2、(8points)FinduoandiointhecircuitinFigure2.Solution:,3、(6points)InthecircuitofFigure3,readingsofvoltmeter，andare10V,18Vand6V,respectively.Pleasedeterminatethereadingofthevoltmeter.Solution:Thereadi

2、ngofthevoltmeteris10V.4、(8points)TheresonantortunercircuitofaradioisportrayedinFigure4,whereus1representsabroadcastsignal,giventhatR=10Ω，L=200μH,Us1rms=1.5mV，f1=1008kHz.Ifthecircuitisresonantwithsignalus1,pleasedeterminate:(1)thevalueofC;(2)thequalityfactorQofthecircuit;(3)thecurrentIrms;(

3、4)thevoltageUcrms.Solution:5、(8points)Abalancedthree-phasecircuitisshowninFigure5.Calculatethephasecurrentsandvoltagesinthedelta-connectedloadZ,if,Z=(24+j15)Ω，ZL=(1+j1)Ω.Solution:,6、(8points)FindtheyparametersforthecircuitinFigure6.Solution:7、(15points)Forthecircuitinfigure7,findthermsvalu

4、eofthecurrentiandtheaveragepowerabsorbedbythecircuit,giventhat,,,,.Solution:P=P0+P1+P2=256+333.28+50=639.28W8、(12points)InthecircuitofFigure8,determinatethevalueofZthatwillabsorbthemaximumpowerandcalculatethevalueofthemaximumpower.Solution:If,Zwillabsorbthemaximumaveragepower.Themaximumave

5、ragepoweris,9、(14points)IftheswitchinFigure9hasbeenclosedforalongtimeandisopenedatt=0,finduc,iL,ukfort≥0.Solution:，10、(15points)TheswitchinFigure10hasbeeninpositionaforalongtime.Att=0,itmovestopositionb.Findi2(t)fort≥0andsketchit.(Attention:Pleasemarkthekeydatainyourgraph.)Solution: