电路理论基础习题答案..doc

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; –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. 10