五.R、L、C元件的有功功率和无功功率 PR=UICOS=UIcos00=UPR=U/R R OR=UISing=UIsin00 =0 PL= UCos= UCos90。=0 3L QL=UIsinp=UIsin900=UI=FXL PCUIcOso=Ulcos(-90)=0 Lc=UIsin o=UIsin(90=-U1F-RXc五. R、L、C元件的有功功率和无功功率 u i R + - PR =UIcos =UIcos0 =UI=I 2R=U2 /R QR =UIsin =UIsin0 =0 i u L + - PL=UIcos =UIcos90 =0 QL =UIsin =UIsin90 =UI=I2XL i u C + - PC=UIcos =UIcos(-90)=0 QC =UIsin =UIsin (-90)= -UI= － I 2XC