1ã
âµR4åR5并è
â´U4=U5ï¼å³I4R4=I5R5
ç±åºå°é夫çµæµå®å¾
I3=I4+I5
解å¾I4=12.5mA
I5=37.5mA
ç±åºå°é夫çµæµå®å¾
I-I1=I2+I3
â´I1+I2=I-I3=50mA
âµR1åR2以åï¼R3+R4ï¼è¿æï¼R3+R5ï¼å¹¶è
â´U1=U2=U3+U4=I3*R3+I4*R4=38.75V+11.25V=50V
æ
ç±æ¬§å§å®å¾
U1=I1R1
U2=I2R2
å¯è§£å¾I2=25mAãI1=25mAãR1=2kΩ
2ãR45ï¼R4åR5ççæçµé»ï¼ä¸åï¼=1/(1/R4+1/R5)=225Ω
R3(45)=R3+R45=1kΩ
R12(345)=1/(1/R1+1/R2+1/R3(45))=500Ω
å³RAB=500Ω
3ãPAB=I^2RAB=5W
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