1ãç¨å å åçæ±ã
çµæµæºåç¬ä½ç¨UA`=Isx(R1+R2//R2)=2x(3+3//3)=2x4.5=9V
Us1åç¬ä½ç¨ï¼UA``=-[Us1/(R2+R3)]R2=-(12/6)3=-6V
ç±äºåUs1çé离ï¼Us2对UAæ ä½ç¨ã
UA=UA`+UA``=9-6=3V
2ãI3=I3`+I31
I3`=220â 90°/100â 53.1°=2.2â 36.9°=1.76+j1.32
I31=380â 120°/50â2â 45°=5.374â 75°=1.39+j5.19
I3=I3`+I31=1.76+j1.32+1.39+j5.19=3.15+j6.51=7.23â 64.2°
éa
3ãuc(0)=10Vãuc(â)=15VãÏ=(R1//R3//R2)C=5000x0.00005=0.25S
uc(t)=15-5e^-4t
éd
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