電路理論基礎(chǔ)習(xí)題答案1-5.1-5.第一章1-1.(a卜(b)吸收10W;(c)、(d)發(fā)出10W.1-2.-1A;-10V;-1A;-4mW.1-3.-0.5A;-6V;—15etV;1.75cos2tA;3Q;2.1.8cos2tW.1-4.u=104i;u=-104i;u=2000i;u=-104i;(d)(d)1-9.9.6V,0.192W,1.152mJ;16V,0,3.2mJ.1-10.1-e-10tA,t>0取s.1-11.3H,6(1-t)2J;3mH,6(1-1000t)2mJ;1-12.0.4F,0. .―--一一一1-13.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,發(fā)72W;3A,吸15W;24V電壓源；3A，電流源或5/3Q電阻.1-19.0,Us/Rl,Us;Us/Ri,Us/Ri,-UsRf/R.1-20.6A,4A,2A,1A,4A;8V,-10V,18V.1-21.K打開：(a)0,0,0;(b)10V,0,10V;(c)10V,10V,0;K閉合：(a)10V,4V,6V;(b)4V,4V,0;(c)4V,0,4V;1-22.2V;7V;3.25V;2V.1-23.10Q.1-24.14V.1-25.-2.333V,1.333A;0.4V,0.8A.1-26.12V,2A,-48W;-6V,3A,-54W.第二章2-1.2.5Q;1.6R;8/3Q;0.5R;42;1.448Q;.R/8;1.5Q;1.269Q;40Q;14Q.2-2.11.11Q;8Q;12.5Q.2-3.1.618Q.2-4.400V;3636V;Ia=5A,電流表及滑線電阻損壞.2-6.5kQ.2-7.0.75Q.2-8.10/3A,1.2Q;-5V,3Q;8V,4Q;0.5A,30/11Q.2-9.1A,2Q;5V,2Q;2A;2A;2A,6Q2-10.-75mA;-0.5A.2-11.6Q;7.5Q;0;2.1Q.2-12.42;1.54;2kQ.2-13.5.333A;4.286A.2-14.(a)-1A2(b)-2A,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.原構(gòu)成無解的矛盾方程組；(改后)4V,10V.2-30.3.33k,50k.2-31.R3(R+R2)is/R1.2-32.可證明Il=—us/R3.2-33.-2;4.2-34.(us1+us2+us3)/3.X第三章3-1.-1+9=8V;6+9=15V;sint+0.2etV.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.編輯版編輯版word3-8.20V,—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.X第四章4-1.141.1V,100V,50Hz,Q02s@,-120o;120o.4-2.7.07/0oA,1/-45°A,18.75/-40.9°A.4-3.Um.3,7.75mA.4-4.10/53.13°A,10/126.87°A,10/-126.87°A,10/-53.13°A;各瞬時(shí)表達(dá)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/-53.13° ,0.05/53.13°S.4-11.52.34V.4-12.10A,141V.4-13.5,0.0577F;3,29.33H;3,0.125F; 0 ,0.02F4-14.3.47,53.2F.4-15.0.316.2cos(1000t108.4)A.4-16.26.3 ,78.8mH,34.6F.4-17.1180V,0.252F.4-18.0.751F.4-19.40.53pF.4-20.10/0°A,10/0°V,200W,1;20A,0;2A.4-21.21.26A,1800W,0846;102,2778W,Q926;2604F.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=31.62/18.43°V,300W,-300Var.4-26.2c°s(t75)A;2VA,j2VA,2VA, j2VA,4VA.4-27.2/-90°A;13.3/11.9°V,7.97-j2.16,3.16/63.4°V,1+j1 .4-28.近似為：j0.5V,50+j50 .4-29.5A,11.09A,10.83A,1066W.4-30.1(21j6).4-31.200/-150°mA.4-32.10H.4-33.5,27.57mH,367.75F.4-34.0.5 ,0.5H;0.25W.4-35.1.86+j0.56,8.10W.4-37.100,0.667H,0.167F,20..4-38.10,0.796mH,3183pF;50.4-39.0.1F;i0.2.2c°s5000tA;uL400.2c°s(5000t90)V.4-40.0.02H,50.4-41.100.5pF,0.091V.4-42.25F,180V.4-43.0.253F,0.760F.4-44.4.12A.4-45.1.174A,376.5V.4-46.30.09A,17.37A.4-47.54.05F.4-48.(1)Ia不變，因?qū)ΨQ時(shí)中線不起作用。(2)仍不變，因?yàn)镾閉合時(shí)各相負(fù)載電壓未變， 電流表所涉及的兩個(gè)A相負(fù)載也未變。4-49. 38/-53.13°A, 38/-66.87°A, 33.59/75°A;64.41/-77.35°A;9.09/-150.0°A;67.68/95.29°A.4-50.190W,380W.4-51.1kW.4-52.6.06A.4-53.871.2W,1161.6Var;290.4W,-668.5Var.4-54.P(『P左+P右；Q(b產(chǎn)￡P(guān)w.4-55.3Ea/(Z3Z1),ZEa/(Z3Z1);可.4-56.0.1103H,91.89F.(4-57~4-58從略.)第五章5-1.c°stV,0.25c°stV;2sintV,0.5sintV;0.25et2e2tV,0.5e2t0.25etV.,, ,di1 di2di1 -di2 ,5-2.根據(jù)u1 4— — u1 —1 2—繪出.dtdt,dtdt5-3.15,2c°s(2t143.13°)V.5-4.(b)讀數(shù)大。5-5.5283mH.5-6.20mH,2.2V,4.4V,4.4V,44mA,22mA,66mA.5-7.1.59/-12.7°A.5-8.13.42/-103°V;1.69/-61.3°V.wordword5-9.1(2MC)5-10.j0.75.5-11.50mH.5-12.20H,2.5W,250V.o o o5-13.4.06/20.98A,0.406/9.05A,8.903/157.8A.5-14.2kW,32kW.5-15.0.09W;3,0.25W.5-16.1.414A.5-17.U2/Ui從3.356降為0.0239.5-18.20—j15,2.8125W.5-19.80.0W,-20.0W,100W.注意到PR1=20W,Pr=60W,可見：電源供給第2線圈共100W的功率，其本身僅耗60W,其余40W經(jīng)互感耦合至第1線圈，線圈1耗20W,還剩20W送還給電源(R=—20W) P=100-20=80W。5-20.9.09A,0.91A

(a) (b)6-8.(a)u=2V;(b)u=6V;coste(cost),當(dāng)cost0,1;(c)u[0,1],當(dāng)cost0;(,1],當(dāng)cost1.6-9.1.71V,4.3A;5.14A,0.857A.5-21.n6-4.7.5mH,2.5mH.(a) (b)(c)6-10.10.83V或5.17V.5-21.n6-4.7.5mH,2.5mH.(a) (b)(c)6-10.10.83V或5.17V.R1R2(ni1i2).RR2(ni1i2)—R1nR2，-RnR25-22.50、2/45 V,500；2/45 ;0.1A.5-23.1.96nF,0.011H,0.0125W.5-24.40k;2mA,4mA;2V,4V.5-25.50pF,80pF,4H;0.25A,0.125A,1.25W.5-26.107rad/s,100;80V,40V;50V,50V,20V,40V.5-27.100pF,250pF,2.74H.第八早6-1.(a)非線性、定常、單向、流控；(b)線性、定常、雙向、單調(diào)；(c)非線性、定常、單向、單調(diào)；(d)非線性、時(shí)變、單向、cos2tw0時(shí)單調(diào)(否則流控)；(e)、⑴非線性、定常、單向、單調(diào)；(g)線性、時(shí)變、雙向、cos2tw-1時(shí)單調(diào)(否則壓控)；5-6-2.1.2510(3coscotcos3⑴t)V.即出現(xiàn)基波和三次諧波。6-3.3,11 ;0.5 ,0.25(d)(f)(d)(f)2+1.463103cos(t-15.37)V;4+1.288103cos(t-38.20)V.6-15.1+(2/3) 103cos628tA.TOC\o"1-5"\h\z2 2616 4un1 3(Un1 un2) 3(un1un2). 2 2\o"CurrentDocument"3(Un1 un2) 3(Un1 un2) 16-17.—1V,2A.6-18.1V,1.667A,1.75A,0.0833A;1.875mV,9.375mA,9.531mA,0.1562mA.X第七章7-1.^Um([&sinat cos2atTOC\o"1-5"\h\z'2 4 131 1-cos4ot—―cos6at35 577-2.EE°sink⑴t,⑴江2九k1k T7-3.Um..t.T,UmtT.7-4.122.9V,10.97A;272.1W.7-5.89.6W編輯版編輯版word7-6.100+20cos314t+14cos(942t+45o)V;101.5V,10.15A,1029.8W.7-7.87.25V,1.69A,1.80A.7-8.2cos(2t+45o)A,3W.7-9.0.894cosc-26.57o)+1.414cos⑵-45o)A;2.8W.7-10.30mH,8.33F,36.9o.7-11.5+5cos(t—45o)V.7-12.0.2533mH,3.166H.7-13.7.523mH,31.86mH,141cost+52.92cos(3t-60o)V.7-14.700W.7-15.160V,2121V,71.06V.7-16.iB=20.3cos(t-169.67o)+1.68cos(3t79.76o)+0.187cos(5t+36.64o)A.7-17.101.8V;223.3V,220.7V;382.2V,223.3V.弘8-17.15e7.5tV,t0.8-18.4,4,0.25F;2.5V,0.8-19.-1020e0.2tV,t0;3.466sec.8-20.(a)4e1.25105tV,t0.(b)-1575et/9V,t0.8-21.32.5e⑵V,t0.8-22.(1)5e1.5tA忑.5e1.5tV,130(1e1.5t)V,t0(2)25J,0;(3)11.11J,5.56J,8.33J;10t一8-23.0.582cos(7t 125) 1.47e A,t 0.8-24.(a).￡(t)￡(t1)e(t2)￡(t 3);.tg(t)(t1)￡(t1);.￡(t) 2(t1))e(t1) 2(t 2)e(t2);.(t1)e(t1)2(t佻(t1)(t 3)￡(t3).8-26.⑴f(tj(2)1.547;(3)f(t1)第八章8-1.dUC10uc120;如-^uL0;dt dtL(1 )8-27.0.661(1e0.476t)e(t)V.8-2.6V,0.2A;10V,10mA;-8V,2A;Us/2;Us/R.8-3.(a)Us/3,Us/(3R),U4(3RC),0;0,0.05,50000V/S,-1000A/S；17V,5A,0,4.5A/s;8-4.0,0,Us/L1,0.8-5.3.330A;2V;-10V,10V/s.8-6. 4e2tV,40e2tA,t03e111.1tV,0.667e111.1tmA,t0;-2.5e5tV,0.5e5tA,t08-7.10e666.7tV,t0;10e2tV,t0.8-8.(a)2e2tA,-16e2tV,t0.(b)2e50tA,6e50tV,t0.8-9.0.24(e500te1000t)A,t08-10.1.024kV;52.66MIQ;4588.4s;50kA;50MW.33333.3t8-11.9(1e)V,t0;12(1e0.1t)V,t0.8-12.i0.50.75e208.33tmA,t08-13.-39.3V,4.192mA,6.212mA.8-14.i 6.325cos(t18.43)e1.572tA,4.472cos(t26.57)e1.572tA,4.472cos(t18.43)2e1.572tA,t08-15.(5et)8V,t08-16.(1)RC并，R=1.333k ,C=0.75F;(2)RL并，R=2k ,L=2H.8-28.8-29.12067.5e250tV,0t0.1s15038.6e57.1(t0.1)V,t0.1su110-12et15V,u21015et15V,10ms;U1U2-55.84e(t10)15V,t-57.3e(t10)15V,t10ms.8-30.0.5(1et)￡(t)0.5[1e(t2)]e(t2).8-31.(1)1-2et,t0;(2)-et,t0;(3)3et5.2cos(t3"),t0.8-32.⑴^^[1e(R1R2)tR1R2C](t);''R1R2'⑵KR^eIRIR2c(R1R2)tR1R2C⑴8-33.(1)d2UC

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dt25du。6dt5diL6.5 2158iL1(t)4(t).8-34.p12 0.417j0.323,欠阻尼.8-35.(aj臨界阻尼； (b)過阻尼。__4t_5t_4t_5t _8-36.60e 40eV;12e 10eV,t0.0.92t 1.31t8-37.3.36e 2.36e V,t08-38.11.414etcos(t135)A.t3t8-39.23eeA,t0;___ 2t2-2(2t1)eA,t0.一一 2t 4t8-40.1.631e -1.892e 0.434cos(t49.4)V,t0.8-41.51500te200tA,t0.8-42.16cos8tV,t0;0.778e0.375tsin0.2856tV,t0.4t _ _4t8-43.(a)10(5e)”t)A;12S(t)12e“t)V.(b)31(1e1.5t)e(t)A;5(t)0.5e1.5te(t)V.38-44.(a)3(0.6670.133e2.4t)e(t)V;0.6譏t) [20.16e2.4t及(t)A.(b)10(42.4e"1.5)e(t)V;t/150.48S(t)0.48e .￡(t)A.8-45.(1)(t3)et(t3);Uo010uC20Us.iLd”11u8-53.而R3Cc0 uC 1di1L2R1L2RM R3c 2 L -dt Lil2mNLil2m2L1L2M2 1 0di2MR1MR2L1 i2 0dt L1l2m2LiL2M2L1L2M2UciCAA習(xí)題8-54、8-55、8-56從略。9-1(a)(2)(t1)[(t1)(t2)].8-46.(1e2t)(t)[1e2(t1)](t1)2[1e2(t2)](t2)4e2(t3)(t3)A.8-47.(1510t10et)(t)[1510t5e(t1)](t1)V.8-48.(1)3-e0.833t(t);0833t

(2)(0.960.8t0.96e. )(t)0.833(t1).[0.960.8t0.16e ](t1)V.R1 R2R2第九章/h\(13)Z,(b)(13)Z9-2.9-3.8-49.8-50.8-51.dUC 1 3-dT 2020diL 3 6"dT 5 5dUC工 4 1￡ 31 6dtdUCIT 0 CC也 二 Bdt Li LidiL2 」 0dt L2Uc01Us.iL5Uc14Us3i0iL1cUc001UsiL1LiR2iL20L29-4.9-5.8-52.(c)(a)(c)UcUo00R2 iL10Us；iL2duc1dt332uC1uSuC1;2j22j4Gj3cl

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dt101166Uci6工011123Uc2120121iL0(e)T9-6.5/31/24178/325/129-7.(a)見右圖;1.6670.041671;Z不存在.159.33Q2.0833S(b)U2OCZ2IIS；Z2i Z22,等效電路從略⑹上US

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