电路电路理论基础习题答案

电路理论基础习 题 快递公司问题件快递公司问题件货款处理关于圆的周长面积重点题型关于解方程组的题及答案关于南海问题 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; –15e–t V; 1.75cos2t A; 3Ω; 1.8cos22t W. 1-4. u =104 i ; u = -104 i ; u =2000i ; u = -104 i ; 1-5. 1-6. 0.1A. 1-7. 1-8. 2(F; 4(C; 0; 4(J. 1-9. 9.6V,0.192W, 1.152mJ; 16V, 0, 3.2mJ. 1-10. 1– e-106 tA , t >0 取s . 1-11. 3H, 6(1– t )2 J; 3mH, 6(1–1000 t ) 2 mJ; 1-12. 0.4F, 0 . 1-13. 供12W; 吸40W; 吸2W; (2V)供26W, (5A)吸10W. 1-14. –40V, –1mA; –50V, –1mA; 50V, 1mA. 1-15. 0.5A,1W; 2A,4W; –1A, –2W; 1A,2W. 1-16. 10V,50W;50V,250W;–3V,–15W;2V,10W. 1-17. (a)2V;R耗4/3W;US : –2/3W, IS : 2W; (b) –3V; R耗3W; US : –2W, IS :5W; (c)2V,–3V; R耗4W;3W;US :2W, IS :5W; 1-18. 24V, 发72W; 3A, 吸15W; 24V(电压源; 3A↓电流源或5/3Ω电阻. 1-19. 0,US/RL ,US ;US/R1 ,US/R1 , –US Rf /R1 . 1-20. 6A, 4A, 2A, 1A, 4A; 8V, –10V, 18V. 1-21. K打开：(a)0, 0, 0; (b)10V, 0, 10V; (c)10V,10V,0; K闭合: (a)10V,4V,6V; (b)4V,4V,0; (c)4V,0,4V; 1-22. 2V; 7V; 3.25V; 2V. 1-23. 10Ω. 1-24. 14V. 1-25. –2.333V, 1.333A; 0.4V, 0.8A. 1-26. 12V, 2A, –48W; –6V, 3A, –54W . ※ 第二章 2-1. 2.5Ω; 1.6R; 8/3Ω; 0.5R; 4Ω; 1.448Ω; . R/8; 1.5Ω; 1.269Ω; 40Ω; 14Ω. 2-2. 11.11Ω; 8Ω; 12.5Ω. 2-3. 1.618Ω. 2-4. 400V;363.6V;IA=.5A, 电流 表 关于同志近三年现实表现材料材料类招标技术评分表图表与交易pdf视力表打印pdf用图表说话 pdf 及滑线电阻损坏. 2-6. 5kΩ. 2-7. 0.75Ω. 2-8. 10/3A,1.2Ω;–5V,3Ω; 8V,4Ω; 0.5A,30/11Ω. 2-9. 1A,2Ω; 5V,2Ω; 2A; 2A; 2A,6Ω. 2-10. –75mA; –0.5A. 2-11. 6Ω; 7.5Ω; 0; 2.1Ω. 2-12. 4Ω; 1.5Ω; 2kΩ. 2-13. 5.333A; 4.286A. 2-14. (a) –1 A↓; (b) –2 A↓, 吸20W. 2-16. 3A. 2-17. 7.33V. 2-18. 86.76W. 2-19. 1V, 4W. 2-20. 64W. 2-21. 15A, 11A, 17A. 2-23. 7V, 3A; 8V,1A. 2-24. 4V, 2.5V, 2V. 2-26. 60V. 2-27. 4.5V. 2-28. –18V. 2-29. 原构成无解的矛盾方程组; (改后)4V,10V. 2-30. 3.33 k(, 50 k(. 2-31. R3 (R1 +R2 ) iS /R1 . 2-32. 可证明 I L =－ uS /R3 . 2-33. –2 ; 4 . 2-34. (uS1 + uS2 + uS3 )/3 . ※ 第三章 3-1. –1+9=8V; 6+9=15V; sin t +0.2 e – t V. 3-2. 155V. 3-3. 190mA. 3-4. 1.8倍. 3-5. 左供52W, 右供78W. 3-6. 1(; 1A; 0.75A. 3-7. 3A; 1.33mA; 1.5mA; 2/3A; 2A. 3-8. 20V, –75.38V. 3-9. –1A; 2A; –17.3mA. 3-10. 5V, 20(; –2V, 4(. 3-12. 4.6(. 3-13. 2V; 0.5A. 3-14. 10V, 5k(. 3-15. 4/3(, 75W; 4/3(, 4.69W. 3-16. 1(, 2.25W. 3-18. 50(. 3-19. 0.2A. 3-20. 1A. 3-21. 1.6V. 3-22. 4A; –2A. 3-23. 23.6V; 5A,10V. 3-24. 52V. ※ 第四章 4-1. 141.1V, 100V, 50Hz, 0.02s,0o, –120o; 120 o. 4-2. 7.07/0 o A, 1/–45 o A, 18.75/–40.9 o A. 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. 4-6. 7.07A; 10A, 50A. 4-7. 173.2(. 4-8. 3.2(, 1.2H. 4-9. 5(, 0.1F. 4-10. 5A; 20/–53.13o(, 0.05/53.13o S. 4-11. 52.34V. 4-12. 10A, 141V. 4-13. 5(, 0.0577F; 3(, 29.33H; 3(,0.125F; 0(,0.02F 4-14. 3.47(, 53.2(F. 4-15. 4-16. 26.3(, 78.8mH, 34.6(F. 4-17. 118.0V, 0.252(F. 4-18. 0.751(F . 4-19. 40.53pF. 4-20. 10/0o A, 10/0o V, 200W,1; 20A, 0；2A. 4-21. 21.26A,1800W,0.846; 10.2(,2778W,0.926; 26.04(F. 4-22. 495W, 0.375. 4-23. 20 + j10(, 2.5W, 0.894. 4-24. 1.99(,31.99(或6.11(, 11(,–19.05(. 4-25. 30+j10=31.62/18.43o V, 300W, –300Var. 4-26. A;2VA, j2VA,2VA, –j2VA, –4VA. 4-27. 2/–90o A; 13.3/11.9o V, 7.97–j2.16(, 3.16/63.4o V, 1+j1(. 4-28. 近似为：j0.5V, 50 + j50(. 4-29. 5A, 11.09A, 10.83A, 1066W. 4-30. . 4-31. 200/–150o mA. 4-32. 10H. 4-33. 5(, 27.57mH, 367.75(F. 4-34. 0.5(, 0.5H; 0.25W. 4-35. 1.86 + j0.56(, 8.10W. 4-37. 100(, 0.667H, 0.167(F, 20.. 4-38. 10(, 0.796mH, 3183pF; 50. 4-39. 0.1(F; 4-40. 0.02H, 50. 4-41. 100.5pF, 0.091V. 4-42. 25(F , 180V. 4-43. 0.253(F , 0.760(F . 4-44. 4.12A. 4-45. 1.174A, 376.5V. 4-46. 30.09A, 17.37A. 4-47. 54.05(F. 4-48. (1) IA不变，因对称时中线不起作用。 (2) 仍不变，因为S闭合时各相负载电压未变，电流表所涉及的两个A相负载也未变。 4-49. 38/–53.13oA, 38/–66.87oA, 33.59/75oA; 64.41/–77.35oA; 9.09/–150.0oA; 67.68/95.29oA. 4-50. 190W, 380W. 4-51. 1kW. 4-52. 6.06A. 4-53. 871.2W, 1161.6Var; 290.4W, –668.5Var. 4-54. P(a) =P左 +P右 ; Q(b) = PW . 4-55. 可. 4-56. 0.1103H, 91.89(F.(4-57~4-58从略.) ※ 第五章 5-1. 5-2. 根据 绘出. 5-3. 5-4. (b)读数大。 5-5. 52.83mH. 5-6. 20mH, 2.2V, 4.4V, 4.4V, 44mA, 22mA, 66mA. 5-7. 1.59/–12.7o A. 5-8. 13.42/–10.3o V; 1.69/–61.3o V. 5-9. . 5-10. j0.75(. 5-11. 50mH. 5-12. 20(H, 2.5W, 250V. 5-13. 4.06/–20.98o A, 0.406/–9.05o A, 8.903/–157.8o A. 5-14. 2kW, 3.2kW. 5-15. 0.09W; 3, 0.25W. 5-16. 1.414A. 5-17. U2 /U1 从3.356 降为0.0239. 5-18. 20 – j15(, 2.8125W. 5-19. 80.0W, –20.0W, 100W. 注意到PR1= 20W，PR2= 60W，可见：电源供给第2线圈共100W的功率，其本身仅耗60W，其余40W经互感耦合至第1线圈，线圈1耗20W，还剩20W送还给电源(P1=－20W) ( P =100－20 = 80W 。 5-20. 9.09A，0.91A 5-21. 5-22. 50 /45( V，500 /45( (；0.1A. 5-23. 1.96nF，0.011H，0.0125W. 5-24. 40k(；2mA，4mA；2V，4V. 5-25. 50pF，80pF，4(H；0.25A，0.125A，1.25W. 5-26. 107rad/s, 100; 80V, 40V; 50V, 50V, 20V, 40V. 5-27. 100pF，250pF，2.74(H . ※ 第六章 6-1. (a) 非线性、定常、单向、流控； (b) 线性、定常、双向、单调； (c) 非线性、定常、单向、单调； (d) 非线性、时变、单向、cos2t≠0时单调(否则流控)； (e)、(f) 非线性、定常、单向、单调； (g) 线性、时变、双向、cos2t≠–1时单调(否则压控)； 6-2. 即出现基波和三次谐波。 6-3. 3(, 11(; 0.5(, 0.25(. 6-4. 7.5mH, 2.5mH. 6-5. 6-6. 6-7. 6-8. (a) u = 2V ；(b) u = 6V ； (c) 6-9. 1.71V, 4.3A; 5.14A, 0.857A. 6-10. 10.83V或5.17V. 6-11. 1.34V, 1.16A,. 2.17A 6-12. 6-13. 6-14. 0.75H, 0.75H, 0.5F; 3H, 3H, 0.25F; 2 + 1.463(10(3 cos(t–15.37()V; 4 + 1.288(10(3 cos(t–38.20()V. 6-15. 1 + (2/3)(10(3 cos628t A . 6-16. 6-17. –1V，2A . 6-18. 1V, 1.667A, 1.75A, 0.0833A;(1.875mV, (9.375mA,(9.531mA,(0.1562mA . ※ 第七章 7-1. 7-2. 7-3. 7-4. 122.9V, 10.97A；272.1W. 7-5. 89.6W 7-6. 100+20cos314 t +14cos(942 t +45o )V; 101.5V, 10.15A, 1029.8W. 7-7. 87.25V, 1.69A, 1.80A. 7-8. 2cos(2 t +45o )A, 3W. 7-9. 0.894cos(t–26.57o )+1.414cos(2t–45o )A; 2.8W. 7-10. 30mH, 8.33(F, 36.9o. 7-11. 5+5cos((t–45o )V. 7-12. 0.2533mH, 3.166(H. 7-13. 7.523mH, 31.86mH, 141cos(t+52.92 cos(3(t–60o)V. 7-14. 700W. 7-15. 160V, 212.1V, 71.06V. 7-16. iB = 20.3cos((t-169.67o )+1.68cos(3(t–79.76o ) +0.187 cos(5(t +36.64o ) A. 7-17. 101.8V; 223.3V, 220.7V; 382.2V, 223.3V. ※ 第八章 8-1. 8-2. 6V,0.2A; 10V,10mA; -8V,2A; US /2;US /R. 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; 52.66MΩ; 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 =1.333k(, C =0.75(F; (2) RL并, R =2k(, L =2H. 8-17. . 8-18. 4(, 4(, 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. 8-45. 8-46. A. 8-47. 8-48. EMBED Equation.3. 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. 9-6. 9-7. (a)见右图； 9-8. (a) (b) 9-9. 1.02W . 9-10. 9-11. 9-12. –1/29 ; 9-13. 9-14. 9-15. 9-16. 4( , 5.493Np ; 6A , 0.0988A . 9-17. –2.5e –10t V，t > 0 . 9-18. 10V, –0.5A . 9-19. ，3.336A . 9-20. j(r 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，0.656A。 10-7. (1)4058mA；(2)302.6N；(3)235.4N。 10-8. 2.888A。 10-9. 约200匝。 10-10. 63W, 15.9(, 57.38(, 0.00445S，0.0162S。 10-11. 12.5W，337.5W, 13.5(, 14.28(。 10-11. 9.92A，1.27A , 0.324S, 0.252S。 ※ 0 t ms p mW 4 100 2 25 0 t ms i mA 4 10 i, A 0.4 .75 t 0 .25 　1.25 ms -0.4 (d) u, V 80 0 　10 -20　 t, ms (f) u, V 100 0 　10 t, ms (e) i A 0 (s 1 1 2 3 1-e-t t p(W) 10 0 　1 2 t(s) -10 –1 19T 20 ––– 11T 20 ––– 3T 10 –– 3 uo(V) 3T 20 –– t –1 0 T (a) 0.5 1 0 　π 2π t i(mA) (b) 1 0.5 1.5 0 　π 2π t i(mA) –1 –2　–1 1 (d)' 0　1　　　3 u i –1 –3　–2　–1 1 (c)' 0　　　2 u i R2 1 -E2 (d) 0 E1 U I R1 1 -IS (e) 0 RIS U I -IS -RIS (f) 0 US U I – 0.15 (b) 0　 15 U,V I,A US/R (c) 0 US U I (a) 0 5V U I + U· 2OC = -Y21U· S / Y21 - a b Z2i = 1/Y22 12.5( ( 50 ７ ( 50 ７ 4( 2( 2( 0.5Ω 2.5Ω 0.25Ω + U2 - I2 + U1 - I1 1.7S -0.9S -1.5S 1.5U1 + U1 - 1S I2 + U2 - + U1 - I1 2S 3S 2U1 1S I2 + U2 - + U1 - I1 2S 3S 20S I2 + U2 - + U1 - I1 10S 5U1 _1037018232.unknown _1037020676.unknown _1037049410.unknown _1071421485.unknown _1071461212.unknown _1072357489.unknown _1072359251.unknown _1072453524.unknown _1072453348.unknown _1072358667.unknown _1071461483.unknown _1071461837.unknown _1071469286.unknown _1071602489.unknown _1071462116.unknown _1071461574.unknown _1071461347.unknown _1071461293.unknown _1071426688.unknown _1071459205.unknown _1071460286.unknown _1071460597.unknown _1071461105.unknown _1071460643.unknown _1071460345.unknown _1071459896.unknown _1071458615.unknown _1071459063.unknown _1071427239.unknown _1071458562.unknown _1071426129.unknown _1071426294.unknown _1071422807.unknown _1037800251.unknown _1071420876.unknown _1071421434.unknown _1071420518.unknown _1037050442.unknown _1037051990.unknown _1037052233.unknown _1037051385.unknown _1037050253.unknown _1037047300.unknown _1037047998.unknown _1037048971.unknown _1037049173.unknown _1037048017.unknown _1037047932.unknown _1037047963.unknown _1037047333.unknown _1037044519.unknown _1037047135.unknown _1037047298.unknown _1037046918.unknown _1037020985.unknown _1037021272.unknown _1037020911.unknown _1037019674.unknown _1037020336.unknown _1037020596.unknown _1037020657.unknown _1037020470.unknown _1037019760.unknown _1037019874.unknown _1037019714.unknown _1037019439.unknown _1037019469.unknown _1037019476.unknown _1037019448.unknown _1037019222.unknown _1037019239.unknown _1037019306.unknown _1037018653.unknown _1037015598.unknown _1037017578.unknown _1037017898.unknown _1037018046.unknown _1037018086.unknown _1037018011.unknown _1037017687.unknown _1037017786.unknown _1037017647.unknown _1037015859.unknown _1037016039.unknown _1037016231.unknown _1037017576.unknown _1037015874.unknown _1037016037.unknown _1037015670.unknown _1037015785.unknown _1037015660.unknown _1036919008.unknown _1036917245.unknown _1036610376.unknown _950249097.unknown _950250903.unknown _950251270.unknown _950251402.unknown _950249347.unknown _950248810.unknown