部分习题答案
1-1 1.B 2.B 3.D 4.A 5.D 1-2 1.× 2.√ 3.× 4.× 5.×
1-3 (a) U?5V (b) R?10? (c) I??5A (d) U??0.8V 1-4 0.1A,50V
1-6 0.5A,0.45A,108V
1-7 (1)I?20A,URL?110V,UE?114V,PRL?2200W,PE?2400W,P 出?2280W;(2)U?E?120V,UR?0V;(3) U?0V,I?400A 1-9 (1) IN?4A,R?12?;(2)U?0V;(3)I?100A 1-10 E?8V,Ro?1.5? 1-13 Uab?22V,IR?0A
1-14 (a)R?4?;(b);U?40V;(c) I?1.8A;(d)U?26V 1-15 US?12V,R1?3k?,R3?6k? 1-16 U1?14V,U2?18V
1-17 (1)I1??6A,I2??8A,I2??0.8A;(2)Uab??16V,Ubc??8V,Uac??24V 1-18 R?2.5?,UA??5V
2-1 1.D 2.D 3.C 4.A 5.B 6.D
2-2 1.× 2.× 3.× 4.√ 5.× 6.× 7.× 8.√ 2-3 I?1A 2-4 U?7.5V
2-5 Ua?1.71V,Ub?3.80V 2-6 I1??1A,I2?4A
2-7 I1?0.57A,I2?0.32A,I3?0.25A,I4?0.09A,I5?0.23A,I6?0.25A 2-8 I1??1A,I2?4A
2-9 I1?0.57A,I2?0.32A,I3?0.25A,I4?0.09A,I5?0.23A,I6?0.25A 2-10 I?3A,PIS1?10W,PIS2?50W,PUS1?25W 2-11 U1?6V,U2?0V,U3?6V
2-13 I1??0.5A,I2??0.5A,I3?1A 2-14 I?1.4A
2-15 I1?3A,I2??1A,I3?5A 2-16 Uab?16V 2-17 I?8.4A 2-18 190mA
2-19 Uoc?42V,Req?1?,I?8.4A
2-20 (a)Uoc?2V,Req?1.5? (b) Uoc?10V,Req?0 2-21 Uoc?10V,Req?2?
2-22 Uoc?2V,Req?4.8?,-0.204A,-0.135A,-0.081A
I?1A Req?4?,Req?2?,2-23 (a)(b) Uoc??2.67V,Isc??1.33A,Uoc?16V,Isc?4A,
I??0.67A
2-24 Uoc?4V,RL?Req?6?,Pmax?0.67W
*2-25 I?3A
*2-26 U?24V 3-1 1.C 2.B 3.A 4.D 5.B 6.C
3-2 1.√ 2.× 3.× 4.√ 5.√ 6.√ 7.×
10.√ 11.√ 12.× 3-3 uC(0?)?1.667V,iC(0?)?0.417mA,uR1(0?)?4.17V 3-4 (a)i(0?)?0A,i(?)?1.5A,(b)i(0?)?2A,i(?)?1.5A 3-5 iL(0?)?3A,iL(?)?6A
3-6 iL(0?)?2mA,uR(0?)??10V 3-7 ??8s,uC(?)?3.68V 3-8 uC(t)?(?6?16e-t)V 3-9 uC(t)?(8?2e-t0.188.× 9.√
)V
3-10 uC(t)?(4?4e-t)V,iC(t)??2e-tA 3-11 iL(t)?(10?10e-500t)A,iL(3ms)?7.768A
3-12 iL(t)?(3.33?1.33e-300t)A,uab(t)?(33.3?26.7e-300t)V 3-13 iL(t)?2e-8tA,uL(t)??16e-8tA 3-14 iL(t)?(2?2e-1t0)A,u(t)?60e-10tV
4-1 1.D 2.B 3.B 4.A 5.B 6.B 7.B 8.B 9.C
10.B
4-2 1.× 2.√ 3.√ 4.× 5.× 6.√ 7.√ 8.× 9.× 10.×
4-3 (1)U?220V,??30?,f?50Hz,T?0.02s;(3)155.5V,177.1V 4-4 i?202sin(314t?90?)A
4-5 (1) i1?52sin(314t?30?)A,i2?102sin(314t?30?)A;(2)??0 4-7 u?102sin(?t?23?)V 4-8 i2?52sin(?t?67.5?)A 4-9 U?100V
??20 -60?A 4-10 (1)u?1.2562sin314tV;(2)I??314?10?6 -120?V 4-11 (1)i?0.89cos314tA;(2)U4-12 (1)电阻;(2)电感;(3)电容;(4)电阻与电感串联 4-13 R?20?,L?1.19mH
??44 36.87?A,容性;100Hz时,I??25.88 -61.93?A,感性 4-14 50Hz时,I4-15 3A
4-16 R?10?,L?55mH 4-17 11V
4-18 U?40V,I?102A
4-19 (1)250rad/s;(2)500rad/s;(3)1000rad/s
??11 -60?A,I??5.5 -60?A,I??16.5 -60?A;4-20 (1)I(2)P?1815W,Q?3143Var; 12(3)0.5,感性
4-21 R?1k?,C?0.1μF,滞后
4-22 cos??0.682,R?15?,L?51.3mH
4-23 P?580.8W,Q??774.4Var,S?968V?A 4-24 (1)cos??0.5 (2)C?90.3μF
4-25 (1)R?250?,RL?43.75?,L?1.48H;(2)PR?40W,P?47W,cos??0.53;
(3)C?3.46μF
4-26 Z?105?j45?,I?1.75A,I1?I2?1.237A
4-27 I?1.43A,I1?0.37A,I2?1.29A,P?84.83W
4-28 C?0.1μF,uR?sin5000tV,uL?40sin(5000t?90?)V,uC?40sin(5000t?90?)V 4-29 能
4-30 (1)1062μF (2)531μ1,25A 4-31 L1?1H,C?1μF 4-32 L1?5-1 1.C
122(?2??1)C,L2?3.C
1?12C
5.B
6.C 6.√
7.×
8.√
2.D 4. D
5-2 1.√ 2.√ 3.√ 4.× 5.×
5-3 (1)IL?IP?4.4A,P?348.5W;
(2)IP?4.4A,IL?7.6A,P?348.5W 5-4 IL?36.5A,Z?(50.4?j37.8)? 5-5 (1)I1?I2?I3?0.15A;
(2)UA?UB?190V,不能正常发光。 5-6 U?380V,I?6.6A
5-7 (1)略;(2)IL?IP?45.45A;(3)略