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4Vçµåæºçæçµé»ä¸º1+2//2=2Ω
(1/2+1/2+1/2)U=4/2+6/2
(3/2)U=10/2
U=10/3 V
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I1=220â 30°/20=11â 30°A
I2=220â 30°/10â -90°=22â 120°A
I3=220â 30°/Z3=220â 30°/â(12^2+16^2)â arctg16/12
=220â 30°/20â 53.1°=11â -23.1°A
I=I1+I2+I3=11(0.866+j0.5)+22(-0.5+j0.866)+11(0.92-j0.392)
=8.646+j20.24=22â 66.9°A
P=UIcosÏ=220x22cos(-36.9°)=3870W
äºã
Up=220V
Ip=220/10=22A
IL=â3Ip=38.1A
2.P=â3UIcosÏ=â3x380x38.1cos53.1°=15057W
3.Cç¸çµæµç¸é为ï¼Ic=220â 120°/10â 53.1°=22â 66.9°A