文档介绍：电工学简明教程第二版(秦曾煌主编)(2)(2)(1)(1)(3)(2)(3)(2)(1)(2)(4)(1)(1)(3)(2)(3)(3)=220V,I1=10A,I2=52AU=2202sinwtVU=220<00Vi1=102sin(wt+900)Ai1=10<900Ai2=10sin(wt-450)Ai1=52<-=220ej300vu=2202sin(wt+300)Vi=-4-j3A=5ej(-143i)i=52sin(wt-)Ai'=4-j3A=5ej(-)i'=52sin(wt-)(1)220V交流电压S打开I=0AUR=UL=0VUC=220VS闭合UR=220VI=220V10Ω=22AUL=0VUC=0Vj2∏fLU=380V,I=30mA(2)U=2202sin(314t)vS打开UR=wLI=10*22=220VUC=1wcI=220VZ=R+j(wL-1wc=10+j(10-1314*1003140)=10ΩI=UZ=22010=22S闭合I=U|U|=220102=112AUR=RI=1102VUL=wLI=1102VUC=0VZ=R+jwL=10+j*314*=10++(wL)2=UI16002+(314L)2=380I30*10-3L=40(H)+(wL)2==>62+(314L)2=1212=>L=(mH)R=UI=12020I==UR2+(2πfL)2=3802002+(314*)=(mA) λ=cosφ1=RZ===2πf=314rad/swL=314*==U|Z|=220(28+20)2+=(A)U灯管=R1*I=103VU镇=202+()2*=190VU灯管+U镇=203》=(314t-330)VU=2202sin(314t+200)VZ=UI=30+j*40ΩReq=30ΩwLeq=40Leq=127(mH)λ=cosφ1=RZ==I2Req=(W)Q=wLeqI2=(var)=16280**10-6=159KU2U1=RR+j(-1wC)=RR-j(-159*103)tan600=159*103r=>R==RR2+(1wC)2*U1=(v)(a)A0=102A(b)V0=80V(C)A0=2A(d)V0=102V(e)A0=102AV0=(1)A0=5A(2)z2为电阻时,A0最大,值为7A(3)z2为电容时,A0最小,=220<300v,I2=U2R2=11<00AI2=U1R+jx1=11<600AI=I1+I2=113<-300P=UIcosφ=(w)=