电路理论基础习题答案

1、 电路理论基础习题答案第一章1-1. (a)、(b)吸收10W；(c)、(d)发出10W.1-2. 1A; 10V; 1A; 4mW.1-3. 0.5A; 6V; 15et V; 1.75cos2t A; 3; 1.8cos22t W.1-8. 2mF; 4mC; 0; 4mJ.1-9. 9.6V,0.192W, 1.152mJ; 16V, 0, 3.2mJ.1-13. 供12W; 吸40W; 吸2W; (2V)供26W, (5A)吸10W.1-15. 0.5A,1W; 2A,4W; 1A, 2W; 1A,2W.1-17. (a)2V;R耗4/3W;US : 2/3W, IS : 2W; (b

2、) 3V; R耗3W; US : 2W, IS :5W; (c)2V,3V; R耗4W;3W;US :2W, IS :5W;1-19. 0,US/RL ,US ;US/R1 ,US/R1 , US Rf /R1 .1-22. 2V; 7V; 3.25V; 2V.1-23. 10.1-26. 12V, 2A, 48W; 6V, 3A, 54W . 第二章2-1. 2.5; 1.6R; 8/3; 0.5R; 4; 1.448; .2-4. 400V;363.6V;IA=.5A, 电流表及滑线电阻损坏.2-8. 38k;1/3 k2-9. 10/3A,1.2;5V,3; 8V,4; 0.5A,30/

3、11.2-11. 75mA; 0.5A.2-12. 6; 7.5; 0; 2.1.2-14. -24V; 1.6V2-15. 2.5W2-15.2A;-20W2-14. (a) 1 A; (b) 2 A, 吸20W.2-17. 3A.2-18. 7.33V.2-22. 50W; 1050W2-24. 7V, 3A.2-25. 4 V、2.5 V、2V2-26. 22-29. 18V.2-32. 2.5A2-38. 5.5 第三章3-1. 44V; 8V.3-3. 190mA.3-5. 左供52W, 右供78W.3-7. 3A; 1.5mA; 2/3A.3-9. 1A; 17.3mA.3-14.

4、 10V, 5k.3-16. 22.5 V3-18. 3,44W.1,2.25W. 第四章4-3. , 7.75mA .4-4. 10/53.13oA, 10/126.87oA, 10/126.87oA, 10/53.13oA；各瞬时表达式略。4-5. 67.08V, 30V, 25V; 12V, 0, 12V, 0; 0, 0, 12V.4-7. 2756.6.4-9. 11 V.4-11. 5A; 20/53.13o, 0.05/53.13o S.4-13. 5, 0.0577F; 3, 29.33H; 3,0.125F; 0,0.02F4-16. 10 A, 141.4 V.4-24.

5、10/0o A, 10/0o V, 200W,1; 20A, 0；2A.4-26. 495W, 0.375.4-28. 20 + j10V, 2.5W, 0.894.4-30. 30+j10=31.62/18.43o V, 300W, 300Var.4-31. -0.5 j.4-33. 240 W；-320 Var.4-35. .4-40. 1.86 + j0.56, 8.10W.4-41.0.8 + j0.4, 0.225W.4-46. 0.02H, 50.4-48. 25mF , 180V.4-50. 4.12A.4-52. 30.09A, 17.37A.4-53. 2350W；1421

6、W4-54. 4.844-55. 9095W, 2641W.4-60. 6.06A.4-61. 871.2W, 1161.6Var; 290.4W, 668.5Var.第五章5-1. 5-2. 根据绘出.5-5. 5-6. 52.83mH.5-10. 13.42/10.3o V; 1.69/61.3o V.5-14. 50mH.5-17. 2kW, 3.2kW.5-18. 0.09W; 3, 0.25W.5-21. 20 j15V, 2.8125W.5-22. 80.0W, 20.0W, 100W. 第六章6-3. 3, 11; 0.5, 0.25.IU05V(a)IU0 US(c)US/RI

7、,AU,V0 15(b) 0.156-5. 6-8. 1.71V, 4.3A; 5.14A, 0.857A.6-10. 1.34V, 1.16A,2.17A6-14. 6-15. 第七章7-3. 7-4. 122.9V, 10.97A；272.1W.7-5. 89.6W7-7. 87.25V, 1.69A, 1.80A.7-11. 5+5cos(wt45o )V.7-14.100+50cos2vt;1+2 cos(vt90o)V;112.5W7-16.;24W.7-18. 80.5 W . 第八章8-1.8-2. 6V,0.2A; 10V,10mA; -8V,2A; US /2;US /R.8

8、-3. (a) US /3, US /(3R), US /(3RC), 0; (b) 0, 0.05, 50000V/s, -1000A/s; (c) 17V, 5A, 0, 4.5A/s;8-4. 0, 0, US /L1 , 0.8-5. 3.330A; 2V; -10V,10V/s.8-6.; ;8-7. .8-8. (a).(b).8-9. 8-10. 1.024kV; 52.66M; 4588.4s; 50kA; 50MW.8-11. ;.8-12. 8-13. 39.3V, 4.192mA, 6.212mA.8-14.8-15. 8-16. (1)RC并, R =1.333kV,

9、C =0.75mF;(2) RL并, R =2kV, L =2H.8-17.8-18. 4V, 4V, 0.25F; 2.5V, 0.8-19. ; 3.466sec.8-20. (a).(b).8-21. .8-22. (1)(2) 25J, 0; (3)11.11J, 5.56J, 8.33J;8-23. .8-24.8-26. 8-27. .8-28. .8-29. ;.8-30. .8-31. 8-32. 8-33. 8-34. , 欠阻尼.8-35. (a)临界阻尼； (b)过阻尼。8-36. 8-37. 8-38. 8-39. 8-40.8-41. 8-42. 8-43.8-44.

10、 8-45. 8-46. A.8-47. 8-48. .8-49. .8-50. 8-51. ;8-52. ;,.8-53. CAA习题8-54、8-55、8-56从略。第九章9-1. 9-2. 9-3. 9-4. 9-5. + U 2OC = -Y21U S / Y21-abZ2i = 1/Y229-6. 9-7. (a)见右图；12.5VV50V509-8. (a)4V2V2V(b)0.52.50.25+U2-I2+U1-I19-9. 1.02W .1.7S-0.9S-1.5S1.5U1+U1-9-10. 1SI2 +U2 - +U1 -I12S3S9-11. 1SI2 +U2 - +U1

11、 -I12S3S2U120SI2 +U2 - +U1 -I110S5U19-12. 1/29 ; 9-13. 9-14. 9-15. 9-16. 4V , 5.493Np ; 6A , 0.0988A .9-17. 2.5e 10t V，t 0 .9-18. 10V, 0.5A .9-19. ，3.336A .9-20. jvr 2n2C .9-21. , .9-22. .9-23. , 低通；, 带通；, Q值低一些的带通。 第十章10-1. 10-2. (1)相等；(2)B相等，H(a) H(b) ；(3) 均不变；B(a)、B(b) 与H(b)均基本不变；H(a)明显下降。10-3. (1) i2 i1 ；(2) 主要在气隙中。10-4. (1)18.55mA； (2)0.423A； (3)2.65A/cm，60.4A/cm；(4)0.685A；(5)2.65A/cm，6664A/cm。10-5. 176.4A。10-6. 2622.5A，0.65