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1、(第4章习题解)选IMR41A4,2C4,3D4.4A4,54.6C4.7C4.8B计算题4.9斛l)l=10Z60oA,Z2=5Z-45oA相量图见解图4-1而示。/;+2=10cos6(F+j!0si1160o+5cos(-450)+j5sin(-45o)=5+j8.66+3.35-j3.35=8.35+j5.3l=9.9Z32o=9.92sin(wz+32。)A/-/.=IoCoS60+j10sin60o-5cosf-45o)-j5sin(-45o)=5+j8.663.35+j3.35=1.65+jl2.0l=12.IZ82o=12.h2sin(/+82。)A/=0.75ms时il=Io
2、TisinWr+60)=l(2sin(0.7511+)A=-3.66A4.10 解:%=10(h2sin(314/+60o)VM2=3OIsin(314/-30o)V4.11 解;A=-3+j4=5/-53。、A=4+H=5.66/45。4+=-3+j4+4+j4=l+j8A-B=-3+-4-7AB=55.66Z-80=28-j3.9AB=六Z-980=-0.12-j.874.12 解:所求正弦量为u=V3O2+40?v2sin(2sin(ftX+3O3)+42sin(ftir+600)6cos3(P+j6sin30o+4cos6(F+j4sin600=5.196+j3+2+j3.464三7.
3、196+j6.464=9.67A电流表读数为9.67A4.14 解:/=50Hzit=HR+j(X1.-XC)=/(300+j(314l5-)314x5XIO6=;(3(X)-j323)=44IZ-47=44l2sm(314/-47o)V4.15ru22OZ3(TZ=-=i2.2Z-23.1o=100N53.1。=100cos53.F+jl(X)sin53.10=(60+j80)4.16解:U=8/30Z2JZ45=27?4-152(感性)P=UIcosO=822o*(45n)=16Ws(-15rl=425W4.17解:P=UIcos=1105sifi-400W400cos=-,=43.3。+5。Z=?=5/0=22Z43.=U+jl5R=15=4XmHX211f4.18 解:未知电表的读数为U=IOZOo+10Z90o+IOZ-90o=IOZOo读数为IOV4.19 解:图a)RC支路:Z1=IO-jl=1(血N-45KA支路:Z2-10jl-l1-IanM(M220=三J(tan600-lan0o)3I4x2202=25F