电工电子试题库1(14)
发布时间:2021-06-08
发布时间:2021-06-08
Z1
(R2 jXL)( jXC)R2 jX
L
jXC
1000 j51 j195
j5.13(Ω)
Z R1 Z1 2 j5.13(Ω)
U10/0 I1m Sm 1.816/68.7 (A) Z2 j5.13
Z 1.816/68.7 ( j5.13) 9.32/ 21.3 (V) U ICm1m1
U9.32/ 21.3 Cm I2m 1.86/68.7 (A) jXC j5
则 i1=1.816sin(314t+68.7°)(A)
i2=1.86sin(314t+68.7°)(A) uc=9.32sin(314t-21.3°)(V)
2.11 图2.7所示电路中,已知电源电压U=12V,ω=2000rad/s,求电流I、I1。
解:当ω=2000rad/时s
XL L 2000 0.5 10X
C
3
1(Ω) 2(Ω)
1ωC
1
2000 250 10
6
Z1
R2( jXC)R2 jXC
j42 j2
1 j(Ω)
Z R1 jXL Z1 1 j 1 j 2(Ω) U12 I 6/0 (A) Z2
I Z 6/0 (1 j) 8.49/ 45 (V) UC1
U8.49/ 45 I1 C 4.25/ 45 (A) R22
则 I=6(A) I1
=4.25(A)
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