串èï¼
XL=4x0.5=2Ωï¼Z=â(1+2^2)â arctg2/1=â5â 63.4º
U=IZ=(5/â2)â5â 63.4º=7.9â 63.4º
u(t)=7.9â2sin(4t+63.4º)
P=(I^2)R=1x7.9^2=62.4 W
Q==(I^2)XL=2x7.9^2=124.8 Var
cosÏ=cos63.4º=0.45
并èï¼éç¨ä»¥ä¸çµååæ°ï¼ï¼
IR=7.9â 63.4ºï¼IL=7.9â 63.4º/2â 90º=3.95â -26.6º
I=IR+IL=3.54+j7.1+3.5-j1.77=7.04+j5.33=8.8â 37.1º
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