电路分析基础马颖参考答案

1、1-11-21-31-41-51-61-81-101-111-121-131-141-151-161-171-181-192-62-82-92-102-112-12电路分析基础主编马颖部分习题参考答案第1章习题13 = 2A ,丨3 = 6A , Us = 20V。R = 20 Q P = 20W。6V, -30V-10A , -4V , -30V2V, -30V(1) I = 3A ;(2) I1 = 2A , I2 = 1A。(a) R = 7 Q(b) R = 5 Q(c) R = 0.3 Q(d) R = 0.75 Q Pus= Pis = 18W;(b) Pus= 9W , Pis

2、= 18W。2005050 .(1) U 2 V, I mA, 1213 mA ；336(2) U2 = 80V , I = I2 = 10mA , I3 = 0A ;(3) U2 = 0V , I = I3 = 50mA , I2 = 0A。I = 1.5A , U = 2V。U = 7.5V , I = 0.75A。(1) Uo=100V ;(2) Uo = 66.7 V ;(3) Uo = 99.5V。S打开：Va = 100V ； S 闭合：Va = 100/7 V。R3 = 40QS打开：Va = 10.5V , Vb = 7.5V ; S 闭合：Va =0V , Vb =1.6V。

3、Ri = 35Q14 = 13mA, 15 = 3mA。第2章习题(a) 3.4 ;Q (b) 2； (c) 2 Q (d) 2 Q (e) 7 Q (f) 6°QI1 = 6A , I2 = 2.5A , I3 = 3.5A。I1 = 4A , I2 = 1A , U1= 8V , U3= 12V。I1 = 4/15 A , I2 = 26/15 A , Pus = 1.6W, Pis = 49.3W。I1 = 0.4A , I2 = 2A , I3 = 1.6A , U3= 148 V。I1 = 5/7 A , I2 = 9/14 A , Pus1= 50/7 W。2- 13 l

4、x = 2.79A。2- 15 Uo = 30/7 V。第3章习题3- 1 U4 = 0.4 V , Us2= 1.2 V。3-2 (1) I1 = 50mA , I2 = 15mA , l3 = 60mA ; ( 2) Pus= 1.25W, Pls = 3.75W。3- 3 U4= 25 V。3-4 Ix = 15A。3-5 U = 4 V。3-7(a) Uab= 16V , R0 = 3 Q (b) Uab= 7V , Rd = 2.5 Q3-8 I = 0.75A。3-9 I = 1A。3-10 Rl = 4.8 Q Pmax = 20W。3- 11 R = 2 鹭 Us = 16V。

5、第4章习题4- 1 i CdUC 22.2cos314t mA。dt4- 2 (1) i = 0； (2) i = 3x 10-5A； (3) i = 18.84cos(314t+30° )mA ； (4) i = 0.18e-2t mA。84-3(1)S 打开时：Cab 3 口 F；(2) S 闭合时：Cab 3 口F。4-4(1)C 16 F,U 150V ;(2) C 3F,U 200V。4-5C8F, U118V, U2 6V,U312V。4-6 (1) C 20"(2) U 150V。4-7 电路耐压为333.33V，显然，两端加 500V电压不安全。4-8(1)

6、 u = 0；( 2) u = 0.2V ；( 3) u = 1256cos(314t+30° )V；( 4) u = 12e-3t V。1ms。4-9 电压表的读数 U = 500V，该操作不安全，处理方法(略)。4-10Uc(0 ) Uc(0 )4V, h(0 ) 1A, i2(0 )0A,ic(0)h(0 )1A。4-11L(0 ) L(0)3A,h(0) i2(0)1.5A,Ul(0)62h(0 )3V。4-12S闭合前：uc(0)6V, iL(0 )0A ；S闭合后：Uc(0 )Uc(0)6V, iL(0)L(0 )0,i(0 )ic(0 )0, uL(0 ) 6V。4-1

7、3S闭合前：L(0)3A, Uc(0 )0V ；S闭合后：iL (0 )iL(0 )3A, Ul(0 )0V, i(0)il(0 )3A, ic(0 ) 0A。4-14(1) R = 500 Q(2)0.01s。4-162diL iL 5, dt LLR2siL(t)5(1te)，第5章习题5-2I = 0.707A。5-8(1)丨1 丨2 10113 A ;(2)U12U2330。5-10Um= 10V。5-11i 27.5.2 sin314t A , I=27.5A , P :=6050W。5-12f1=50Hz 时：XL1 = 47.1,Q Il1 =4.67A,Ql1 = 1027.4

8、 var。5-13i 11 2sin (100t-120 )A。5-14L = 0.1H , (fj=-60°。5-15I = 15.7mA , i =22.2si n( 314t+60° )A ,频率为100Hz 时,5-19R = 40.3 ,QL =0.13H。5-20交流 1 = 0.1A ;直流 I = 1.1A。5-22Z = 5+ j5 Q5-23U 50 . 2V。5-24Uz 25.2 8Vo5-27R = 30 Q L = 0.127H。5-29I = 0.5mA , Ql1=48.3 var, Ul =:Uc =241.5mV。5-30R = 1.6

9、,QQ =70。5-31(1) C = 80 识(2) I0 :=10V ,Uc =50V , Url =50.25 V4-15(1) R = 100 ；(2)I = 31.4mA。,Q = 5。tUL(t) 5e第6章习题6-3 Uyp= U p= 3925V。6-6 Iyl = 11A , I m = 33A。6-8(2)1 Z I = 22 Q R = 15 Q6-9 Il = 7.65A。6-10 Sy = 14.48 kVA , G = 3925kVA。6-11 (1)A U = 7kV , P = 1.47 X 104kW; ( 2)A U = 10.5kV , P = 3.31kW。6- 12(1) Py = 1452W