电路学习指导书 部分习题答案 部分习题答案 1-1 6W(吸收功率)，4W(吸收功率)，5W(发出收功率)，-5罪（发出收功率） 1一2电流源：-1黑，电阻：0.5W,电压源：0.5W 1-3 7V,4W,1V 1-4.25A,20 1-5(1)4A,12.50(2).52V,.(3)104A 1-6(1)2A(2)U,U变高，2变低 1-7(1)15V,5Y:(2)15V 1-8 69,9N 1-9 30V 1-102A,20V 1-11.21=-1A 1-12-3A,-10A 1-131A 1-143.8V,14.8V,-11V,2.8Y,-1V,12V 1-158y,8 1-161.4V-1A 1-175Y,7V 2-1(a)59,(b)20(c)2.50(d)1.59 2-2K断开时200Q,K闭合时2000 2-3 -4W,16 2-4 (a)1.450,6)100g 2-5(a)109,(b)1.67Q 2-6 2-710W,1500Q 2-81.44 2-98Ω 2-10-15V 2-110.5A 2-120.40 3-1网孔电流依次为0.5A,1A,-2A 3-2 网孔电流依次为1.5A,4.5A,1.5A 各支路电流依次为1.5A,4.5A,3A,0A,3A,1.5A 3-3 -1A,3A,6A,4A 3-40.8A,-1A,0.2A,5.2A,4.2A 14
电路学习指导书 部分习题答案 144 部分习题答案 1－1 6W(吸收功率),4W(吸收功率),5W(发出收功率) ,-5W(发出收功率) 1－2 电流源：-1W，电阻：0.5W,电压源:0.5W 1－3 7V，4V，1V 1－4 25A, 2Ω 1－5 （1）4A ，12.5Ω (2) 52V, (3) 104 A 1－6 (1) 2A (2) U1 , U3 变高，U2 变低 1－7 (1) 15V, 5V; (2) 15V 1－8 6Ω，9V 1－9 30V 1－10 2A, 20V 1－11 2I= －1A 1－12 －3A, 10A 1－13 1A 1－14 3.8V, 14.8V, －11V, 2.8V, －1V, 12V 1－15 8V ,8V 1－16 1.4V, －1A 1－17 5V, 7V 2－1 (a) 5Ω ,(b) 2Ω (c) 2.5Ω (d) 1.5Ω 2－2 K 断开时 200Ω ,K 闭合时 200Ω 2－3 －4V, 16V 2－4 (a) 1.45Ω ,(b) 100Ω 2－5 (a) 10Ω ,(b) 1.67Ω 2－6 (c) 1V 2－7 10V, 1500Ω 2－8 1.4A 2－9 8Ω 2－10 －15V 2－11 0.5A 2－12 0.4Ω 3－1 网孔电流依次为 0.5A, 1A, －2A 3－2 网孔电流依次为 1.5A, 4.5A, 1.5A 各支路电流依次为 1.5A, 4.5A, 3A ,0A ,3A, 1.5A 3－3 －1A ，3A , 6A , 4A 3－4 0.8A ,－1A, 0.2A ,5.2A ,4.2A
”电路学习指导书 部分习题答案 3-54.38A 3-6 3A 3-7 -2A,-2A,3A 3-85A,-2A,3A 3-9 网孔电流依次为14A,20A,12A 3-105A,-4A,6A,9A,-1A,4A,9A,10A 3-142.5mA,0.67al,3.17mA 3-15-6V 3-16-2A,6A,5A,1A,9A,8A 3-171A,2A,3A,1A,1A 3-18,-0.5A,3A,2.5A,0.5A,2.5A,2A 3-198A,0A,2A,-2A,-10A 3-20受控电流源的电流为5.78A,受控电压源的电压为5.33V 4-1(a)1.75mA,(6)80v 4-2 25V 4-3,160 4-480V 4-5.0.5N 4-68N 4-7 1 4-8 -8A 4-9 3.64W 4-1113V,4Q 4-121A 4-13.80 4-148V 4-1515V ，27.50 4-160.44A 4-173A,0.667S 4-180.75A 4-1930,5.33m 4-20-1A 5-2“1v 5-38.44A 5-4.3.3X0,50K0 145
电路学习指导书 部分习题答案 145 3－5 4.38A 3－6 3A 3－7 －2A , －2A, 3A 3－8 5A ,－2A, 3A 3－9 网孔电流依次为 14A, 20A, 12A 3－10 5A, －4A, 6A, 9A, －1A , 4A, 9A, 10A 3－14 2.5mA, 0.67mA, 3.17mA 3－15 －6V 3－16 －2A ,6A, 5A ,1A ,9A ,8A 3－17 1A ,2A ,3A ,1A ,1A 3－18 －0.5A ,3A, 2.5A ,0.5A ,2.5A ,2A 3－19 8A ,0A ,2A ,－2A ,－10A 3－20 受控电流源的电流为 5.78A , 受控电压源的电压为 5.33V 4－1 (a) 1.75mA , (b) 80V 4－2 25V 4－3 160V 4－4 80V 4－5 0.5V 4－6 8V 4－7 1V 4－8 －8A 4－9 3.64V 4－11 13V ,4Ω 4－12 1A 4－13 8Ω 4－14 8V 4－15 15V , 27.5Ω 4－16 0.44A 4－17 3A , 0.667S 4－18 0.75A 4－19 3Ω , 5.33W 4－20 －1A 5－2 1V 5－3 8.44A 5－4 3.3KΩ , 50KΩ
·电路学习指导书 部分习题答案 5-5 GG: (G1+G2+G,+G4)+G,G。 5-610 5-7RR.+RjRs+RRs RR 6-1u=(2+0.1sint)y 6-3u1=10.828y或5.172y 6-43.2A,3.04A,5.85A,6.75A 6-5(1+cosor)A 6-7（-2/3c+Ui)iv 7-1(1)U1=100V,平1=-120°，U2=50V,平2=60°，f=50HZ,T=0.02S: (2)U1=100∠-120V,02=50∠60V,Φ=180°· 7-2(1)2.5+j4.33:(2)-22.5+j38.97:(3)-3.2-j0.112:(4)11.83+j25.38 7-3(1)8.154∠66.89°：(2)1,529∠-78.69°： (3)131.7∠45.71°：(4)10∠-126.87 7-4(1)u=19.42√2cos(wt14.52°)V: (2)u=16.53√2cos(wt+98.42°)V 7-5(2）U3=(15+j48)V=50.29∠72.65°V,U6=122.82∠21.84°V 7-6(2)=122.82√2cos(628t21.84°)，M4=99.55√2cos(628t+106°)V. 7-8111.8V2cos(6280t26.57°)y 7-925∠20°V,15.7∠110°V,29.52∠52.13°V 7-10(a)67.08v:(b)28.28v 7-1113A 7-1314.14∠45°A,100∠0°V 7-145∠45°V 7-152∠0°A,28.28∠45°V 146
电路学习指导书 部分习题答案 146 5－5 1 2 3 4 3 4 1 3 G G G G G G G G （ + + + ）+ 5－6 10V 5－7 1 5 3 4 3 5 4 5 R R R R + R R + R R 6－1 u=(2+0.1sint)V 6－3 uR1= 10.828V 或 5.172V 6－4 3.2A , 3.04A , 5.85A , 6.75A 6－5 (1+ cost 7 1 )A 6－7 (－2t/3C+ 3 2 U0 ) 2 3 V 7-1 (1) U1 =100V , Ψu1 = −120 , U2 = 50V , Ψu2 = 60, f = 50HZ, T = 0.02S ； (2) U 1 =100 −120V , U 2 = 5060V , Φ=180° 7-2 (1) 2.5+j4.33；(2) -22.5+j38.97；(3) -3.2-j0.112； (4) 11.83+j25.38 7-3 (1) 8.154∠66.89°；(2) 1,529∠-78.69°； (3) 131.7∠45.71°；(4) 10∠-126.87° 7-4 (1) u =19.42 2 cos(ωt-14.52°)V； (2) u =16.53 2 cos(ωt+98.42°)V 7-5 (2) U5 =(15+j48)V=50.29∠72.65°V, U6 =122.82∠21.84°V 7-6 (2) u3 =122.82 2 cos(628t-21.84°)V, u4 =99.55 2 cos(628t+106°)V. 7-8 111.8 2 cos(6280t-26.57°)V 7-9 25∠20°V, 15.7∠110°V, 29.52∠52.13°V 7-10 (a) 67.08V；(b) 28.28V 7-11 13A 7-13 14.14∠45°A, 100∠0°V 7-14 2 ∠45°V 7-15 2∠0°A, 28.28∠45°V
”电路学习指导书 部分习题答案 8-1(a)2'R+jwL+ )+C++ (c) B乃+joljc 8-2(1)(1-j2)Q:(2)(2-j1)0:(3)400:(4④)joL-r 8-3(a)0.032S,0.012F:(b)2.07Q,0.013F 8-52∠0°A,28.28∠45°V 8-60.1312∠128.65°A 8-7J=44.72∠76.57°V 8-886.60,50μH 8-9222,0.2779H 8-10a2=1 2LC 8-1113.330 8-12(a)10∠0°V:(6)10∠-90°V。 8-14设i2=10∠90°A,10√2∠45°A,5√2∠45°V。 8-153.16∠-18.43°A,1.41∠45°A 8-16(15.03-j40.02)Q 8-17B=-41 8-18(100+j10√3)0,100Q或(50+j50V3)Q,(50-j50W3)0 8-21(a)Ucc=3∠0°V,Za=3∠0°Q:)ic=2∠-90°A,Yea=0s 8-2219.66∠31.9°mA 8-24151.7VA,45W,144.5VAR,0.286 8-2551=1936∠36.86°VA,52=1141∠-45°VA,5=2382.3∠8.55°VA 8-26(1)S,=9834VA,S2=11000VA,S,=13200NA:(2)=9L.78A,S=20.19KVA 8-27257.83μF 8-28Z1=(5-j1)9,1.3w 8-29w。=5×103rad/s,f0=79.6KZ,p=10K0,4100,U=Uc=1000VN 8-30G0.1μf 9-2均为0.667H 9-3(a)0.707∠45°0 多
电路学习指导书 部分习题答案 147 8-1 (a) Z= R1 +j ω L+ C R C R j 1 j 1 2 2 + ； (b) Z= R1 + jC 1 + R L R L j j 2 2 + ； (c) Y= 1 1 R + R jL 1 2 + +jωC 8-2 (1) (1-j2)Ω；(2) (2-j1)Ω；(3) 40Ω；(4) jωL-r 8-3 (a) 0.032S, 0.012F；(b) 2.07Ω, 0.013F 8-5 2∠0°A, 28.28∠45°V 8-6 0.1312∠128.65°A 8-7 U =44.72∠76.57°V 8-8 86.6Ω, 50μH 8-9 22Ω, 0.2779H 8-10 ω 2 = 2LC 1 8-11 13.33Ω 8-12 (a) 10∠0°V；(b) 10∠-90°V。 8-14 设 2 I =10∠90°A, 10 2 ∠45°A, 5 2 ∠45°V。 8-15 3.16∠-18.43°A, 1.41∠45°A 8-16 (15.03-j40.02)Ω 8-17 β=-41 8-18 (100+j10 3 )Ω, 100Ω或(50+j50 3 )Ω, (50-j50 3 )Ω 8-21 (a) UOC =3∠0°V, Zeq =3∠0°Ω；(b) ISC =2∠-90°A, Yeq =0S 8-22 19.66∠31.9°mA 8-24 151.7VA, 45W, 144.5VAR, 0.286 8-25 S1 =1936∠36.86°VA, S2 =1141∠-45°VA, S =2382.3∠8.55°VA 8-26 (1) S1 =9834 VA, S2 =11000VA, S3 =13200VA；(2) I=91.78A, S=20.19KVA 8-27 257.83μF 8-28 Z L =(5-j1)Ω, 1.3W 8-29 ω 0 =5 10 5 rad/s, ƒ 0 =79.6KHZ, ρ=10KΩ, Q=100, UL =UC =1000V 8-30 C=0.1μF 9-2 均为 0.667H 9-3 (a) 0.707∠45°Ω
·电路学习指导书 部分习题答案 9-5(20+j10)0,(18+j14)Q 9-6(14+j7)0 9-752.86ml 9-8(1)136.4∠-119.7°V,311.1∠22.38°V:(2)33.33μF 9-941.52rad/s 9-100oc=30∠0°V,Zeg=3+j7.50 9-12i,=j2=1.104∠-83.66°A,ic=0 9-133.835∠4.4°V 9-147.155cos(5tr26.6°)V 9-150.1106cos(314-64.8°)A,0.3503cos(314t+1.1°)A 9-161∠0°.V 9-172.236 9-1812.5Q 10-1相电压：220∠30°V,220∠-90°V,220∠150°V 线电压：380∠60°V,380∠-60°V,380∠180°V 10-20v,440N 10-31.174A,376.5V 10-430.08A,17.37A 10-5(1)6.64A,1587W:(2)19.92A,11.5A,4761W 10-63.593A,1162W 10-7(1)5A,2.887A,2.887A:(2)4.33A,0A,4.33A 10-8394.97V 10-9Z:Vp1=216.96Y,1p1=5.42A,B=3KW:Z2:Vp2=375.78Y,1p2=6.263A, B=5.65KW:Pe=8.723Km,cos中=0.814 10-10(1)6.1A:(2)3350W 10-11332.9V,0.992 10-12设0AB=380∠30°V,W1:0,W2:3939m 10-13803W,1893W 10-14线电流：iA=13.914∠-18.44°A: 相电流：iA=22∠-53.13°A,iAB=7.63∠120°A余类推 10-17iA=5.18∠50.56°A,5=(2166-j2633)VA 1 3x5os41+ 1 11-34.27A,52.7V,219W
电路学习指导书 部分习题答案 148 9-5 (20+j10)Ω, (18+j14)Ω 9-6 (14+j7)Ω 9-7 52.86mH 9-8 (1) 136.4∠-119.7°V, 311.1∠22.38°V；(2) 33.33μF 9-9 41.52rad/s 9-10 UOC =30∠0°V, Zeq =3+j7.5Ω 9-12 L1 I = L2 I =1.104∠-83.66°A, IC =0 9-13 3.835∠4.4°V 9-14 7.155cos(5t-26.6°)V 9-15 0.1106cos(314t-64.8°)A, 0.3503cos(314t+1.1°)A 9-16 1∠0°V 9-17 2.236 9-18 12.5Ω 10-1 相电压: 220∠30°V, 220∠-90°V, 220∠150°V 线电压: 380∠60°V, 380∠-60°V, 380∠180°V 10-2 0V, 440V 10-3 1.174A, 376.5V 10-4 30.08A, 17.37A 10-5 (1) 6.64A, 1587W；(2) 19.92A, 11.5A, 4761W 10-6 3.593A, 1162W 10-7 (1) 5A, 2.887A, 2.887A；(2) 4.33A, 0A, 4.33A 10-8 394.97V 10-9 Z1 : VP1 =216.96V, IP1 =5.42A, P1 =3KW ； Z2 : VP2 =375.78V, P2 I =6.263A, P2 =5.65KW； P总 =8.723KW, cosφ=0.814 10-10 (1) 6.1A；(2) 3350W 10-11 332.9V, 0.992 10-12 设 UAB =380∠30°V, W 1 :0W, W 2 :3939W 10-13 803W, 1893W 10-14 线电流: IA =13.914∠-18.44°A； 相电流: IA =22∠-53.13°A, IAB =7.63∠120°A 余类推 10-17 IA =5.18∠50.56°A, S =(2166-j2633)VA 11-2 cos4 ) 3 5 1 cos2 1 3 1 cos 2 4 1 ( 2 1 1 1 m + − = + t + t t U u 11-3 4.27A , 52.7V , 219W
电路学习指导书 部分习题答案 11-412.83cos(10001-3.71)-1.396sn(20001-64.3)A,916W 11-5(1)102,31.86mH,318.3μF:(2)-99.45°：(3)515.4W 11-6 0.833+14.03sim(3141+19.32)-0.941c0s(6281+54.55)+0.487sim9421+71.19)A, 120W,91.38V,1.497A 11-71H,66.67m 11-8=50cos101-110)-75sin(301-30)V,9.35A,63.74V 1 12-1(a)y]= joL joL -1 :6)Y门= -1 5 12-2(a)[]= 4-35-3 「317 :)Z= 5 12-3(a)y]= 司 wm 12-550,50,50,32 4o2r2 12-7(a)X=0.1227S,y2=0.08181S,Y3=0.04091S: (b)Y=3S,Y2=2S,=1S,VCCCS电流为2U, 12-81=Y2= -:2=1= (jo)C RC 20o+R)R00+ 2(S+2RC)jo+RC
电路学习指导书 部分习题答案 149 11-4 12.83cos(1000t −3.71) −1.396sin(2000t − 64.3)A , 916W 11-5 (1) 10 , 31.86mH , 318.3μ F ；(2) − 99.45 ；(3) 515.4W 11-6 0.833 +14.03sin(314t +19.32) − 0.941cos(628t + 54.55) + 0.487sin(942t + 71.19)A, 120W , 91.38V , 1.497A 11-7 1H , 66.67mH 11-8 u2 = 50cos(10t −110) − 75sin(30t − 30)V , 9.35A , 63.74V 11-9 2 49 1 1 L = , 2 9 1 1 C = 12-1 (a) + − − = C L L L L Y j j 1 j 1 j 1 j 1 [ ] ；(b) − − + = L L L L C Y j 1 j 1 j 1 j 1 j [ ] 12-2 (a) − − = 3 5 3 4 3 4 3 5 [Y] ；(b) = 2 3 2 1 2 1 2 3 [Z] 12-3 (a) − − = 4 1 4 1 12 1 12 5 [Y] ； (b) − − = 5 3 2 1 2 3 [Y] 12-4 (a) − = 0 1 1 2 1 [H] ； (b) = 4 11 2 5 2 1 1 [H] 12-5 5 , 5 , 5 , 3 ； 12-6 (a) 4 2 2 L C L − ； (b) 4 1 4 2 2 LC − L 12-7 (a) Y1 = 0.1227S ，Y2 = 0.08181S ，Y3 = 0.04091S ； (b) Y1 = 3S， Y2 = 2S， Y3 =1S， VCCCS 电流为 2U1 12-8 ) 2 (j ) 1 (j ) 2 1 2(j ) 1 j (j 11 22 RC R RC RC RC C Y Y + + + + + = = ； + + + = = − RC 2 j R C 1 ) 2RC 1 2(S (j ) C 2 2 12 21 Y Y
电路学习指导书 部分习题答案 12-9(a) :)[4A2+B AY+C BY+D C CZ+D jo(LL-M) 12-10 M 品 12-11 「3.25j27] n.02so.1 12-12n=2 12-13S2+25+5 S2+S+4 13-1.(12V0,6mA,-6mA) 13-2.(1A1.67A-4V) 13-3.4.=2eaV,1≥0 13-4.iz(0=10e-A,1≥0 135.4.=126e337,1≥0 13-6.i,(0=2e8A,4,0=-16e-V,t≥0 13-7.i0=0.16e-0A,4.=-16e-10y,120 13-8.1,0=3e-120A.0=-1.2e1mA1≥0 13-9.i.0=7.5em4,u.0=30e0y,1≥0 13-10.4,0=-40e80wV,1≥0 13-1.i20=-2/3e-2rA,1≥0 150
电路学习指导书 部分习题答案 150 12-9 (a) AY + C BY + D A B ；(b) + + C CZ D A AZ B 12-10 − − M L M L L M M L 2 2 1 1 2 j M j ( ) 12-11 j0.025 0.1 3.25 j27 12-12 1 2 g g n = 12-13 4 2 5 2 2 + + + + S S S S 13-1. （12V, 0, 6mA, -6mA） 13-2．（1A, 1.67A, -4V） 13-3． 2 , 0 0.1 = − u e V t t c 13-4． ( ) 10 , 0 5 = − i t e A t t L 13-5． 126 , 0 3.33 = − u e V t t c 13-6．i t e A t L 8 ( ) 2 − = ， u (t) L 16 , 0 8 = − − e V t t 13-7． i t e A t 4 10 ( ) 0.16 − = , 16 , 0 4 10 = − − u e V t t c 13-8． i t e A t L 120 ( ) 3 − = ， ( ) 1.2 , 0 120 = − − i t e A t t 13-9． i t e mA t c 50 ( ) 7.5 − = ， ( ) 30 , 0 50 = − u t e V t t c 13-10． ( ) 40 , 0 80 = − − u t e V t t L 13-11． ( ) 2/ 3 , 0 2 = − − i t e A t t L
电路学习指导书 部分习题答案 13-12.u.)=101-ea")P,t20 13-13.20=1-e10)A1≥0 13-14.4.(0=31-e5a0)Ψ，1≥0 13-15.12=1.61-e-)4,4=1.6-1.28e)4,44=6.4e-,1≥0 13-16.4c-121-e4")Ψ 1317.4c=31-er)Ψ，=(1-0.4e0r)4,ic-0.6eaA,1≥0 13-18.i=1-e-1)4,u=(20+10e-10)Ψ，42=20e-y,120 1B-19.u.=Rl,1-e%c),1≥0 13-20.(e=l2-9eas)W,e=4.5e0sA 13-21.iz=(2-e-)A 13-22.ic=3e2m4 13-23.4c=(-5+15e-1o)Ψ 13-24.4=25e-V 13-25.c=(-10+20e02) 13-26.uc=(-1+3e0.s)/ 13-27.2=2+4eA,4z=-48e07 13-28.12=3-5e4i=5-5e0A 13-29.4e=21-e0)s0 13-30.41=[506)-250e-0 151
电路学习指导书 部分习题答案 151 13-12． ( ) 10(1 ) , 0 0.1 = − − u t e V t t c 13-13． ( ) (1 ) , 0 10 = − − i t e A t t L 13-14． ( ) 3(1 ) , 0 5 5 10 = − − u t e V t t c 13-15．i e A i e A t t L 1.6(1 ) , (1.6 1.28 ) 10 1 −10 − = − = − ， 6.4 , 0 10 = − u e V t t L 13-16． u e V t C 12(1 ) −4 = − 13-17．u e V i e A t t C 3(1 ) , (1 0.4 ) 0.1 1 −0.1 − = − = − ， 0.6 , 0 0.1 = − i e A t t C 13-18． i e A u e V t t L (1 ) , (20 10 ) −10 −10 = − = + ， 20 , 0 10 = − u e V t t L 13-19． (1 ), 0 ( ) 1 1 2 = − + − u R I e t R R C t c s 13-20．( u e V i e A t C t C 0.5 0.5 (12 9 ) , 4.5 − − = − = 13-21．i e A t L (2 ) −3 = − 13-22．i e mA t C 25 3 − = 13-23．u e V t C ( 5 15 ) −10 = − + 13-24．u e V t L 5 25 − = 13-25．u e V t C ( 10 20 ) −0.2 = − + 13-26．u e V t C ( 1 3 ) −0.5 = − + 13-27．i e A u e V t L t L 20 20 2 4 , 48 − − = + = − 13-28．i e A i e A t t L 0.5 0.5 3 5 , 5 5 − − = − = − 13-29． 2(1 ) ( ) 1 u e t t RC C − = − 13-30．u t e t V t L [50 ( ) 250 ( )] 5 − = −
电路学习指导书 部分习题答案 152
电路学习指导书 部分习题答案 152