2. Dong Dien Khong Doi 11.10545

Phm Th Hin THPT chuyn Lng Vn Ty Dng in khng i Dng 1: i cng v dng in, A, P- 1:Cu hi 1: Dng in l: A. dng dch chuyn ca in tch B. dng dch chuyn c hng ca cc in tch t do C. dng dch chuyn c hng ca cc in tch t do D. dng dch chuyn c hng ca cc ion dng v m Cu hi 2: Quy c chiu dng in l: A.Chiu dch chuyn ca cc electron B. chiu dch chuyn ca cc ion C. chiu dch chuyn ca cc ion m D. chiu dch chuyn ca cc in tch dng Cu hi 3: Tc dng c trng nht ca dng in l: A. Tc dng nhit B. Tc dng ha hc C. Tc dng t D. Tc dng c hc Cu hi 4: Dng in khng i l: A. Dng in c chiu khng thay i theo thi gian B. Dng in c cng khng thay i theo thi gian C. Dng in c in lng chuyn qua tit din thng ca dy khng i theo thi gian D. Dng in c chiu v cng khng thay i theo thi gian Cu hi 5: Sut in ng ca ngun in nh ngha l i lng o bng: A. cng ca lc l tc dng ln in tch q dng B. thng s gia cng v lc l tc dng ln in tch q dng C. thng s ca lc l tc dng ln in tch q dng v ln in tch y D. thng s cng ca lc l dch chuyn in tch q dng trong ngun t cc m n cc dng vi in tch Cu hi 6: Tnh s electron i qua tit din thng ca mt dy dn kim loi trong 1 giy nu c in lng 15C dch chuyn qua tit din trong 30 giy: A. 5.106 B. 31.1017 C. 85.1010 D. 23.1016 Cu hi 7: S electron i qua tit din thng ca mt dy dn kim loi trong 1 giy l 1,25.10 19. Tnh in lng i qua tit din trong 15 giy: A. 10C B. 20C C. 30C D. 40C Cu hi 8: Hai in tr mc song song vo ngun in nu R1< R2 v R12 l in tr tng ng ca h mc song song th:A. R12 nh hn c R1v R2.Cng sut tiu th trn R2 nh hn trn R1. B.R12 nh hn c R1v R2.Cng sut tiu th trn R2 ln hn trn R1. C. R12 ln hn c R1 v R2. D. R12 bng trung bnh nhn ca R1 v R2 R2 R3 Cu hi 9: Ba in tr bng nhau R1 = R2 = R3 mc nh hnh v. Cng sut tiu th: A. ln nht R1 B. nh nht R1 R1 C. bng nhau R1 v h ni tip R23 D. bng nhau R1, R2 , R3U

Cu hi 10: Hai bng n c hiu in th nh mc ln lt l U1 = 110V, U2 = 220V. Chng c cng sut nh mc bng nhau, t s in tr ca chng bng: A. B. C. D. P N 5 D

Cu p n 1

1 B

2 D

3 C

4 D

6 B

7 C

8 A

9 A

10 C

Ngy mai ang bt u t ngy hm nay

Phm Th Hin THPT chuyn Lng Vn Ty Dng in khng i Dng 1: i cng v dng in, A, P- 2:Cu hi 11: bng n 120V 60W sng bnh thng mng in c hiu in th 220V ngi ta mc ni tip n vi in tr ph R. R c gi tr: A. 120 B. 180 C. 200 D. 240 Cu hi 12: Ba in tr bng nhau R1 = R2 = R3 ni vo ngun nh hnh v. Cng sut tiu th : A. ln nht R1 C. bng nhau R1 v b hai in tr mc song song B. nh nht R1 D. bng nhau R1, R2 v R3R1 R2 R3 U

Cu hi 13: Khi hai in tr ging nhau mc song song v mc vo ngun in th cng sut tiu th l 40W. Nu hai in tr ny mc ni tip vo ngun th cng sut tiu th l: A. 10W B. 80W C. 20W D. 160W Cu hi 14: Mc hai in tr R1 = 10 , R2 = 20 vo ngun c hiu in th U khng i. So snh cng sut tiu th trn cc in tr ny khi chng mc ni tip v mc song song thy: A. ni tip P1/P2 = 0,5; song song P1/P2 = 2 C. ni tip P1/P2 = 2; song song P1/P2 = 0,5 B. ni tip P1/P2 = 1,5; song song P1/P2 = 0,75 D. ni tip P1/P2 = 1; song song P1/P2 = 2

Cu hi 15: Mt bp in gm hai dy in tr R 1 v R2. Nu ch dng R1 th thi gian un si nc l 10 pht, nu ch dng R2 th thi gian un si nc l 20 pht. Hi khi dng R1 ni tip R2 th thi gian un si nc l bao nhiu: A. 15 pht B. 20 pht C. 30 pht D. 10pht Cu hi 16: Mt bp in gm hai dy in tr R 1 v R2. Nu ch dng R1 th thi gian un si nc l 15 pht, nu ch dng R2 th thi gian un si nc l 30 pht. Hi khi dng R1 song song R2 th thi gian un si nc l bao nhiu: A. 15 pht B. 22,5 pht C. 30 pht D. 10pht Cu hi 17: Mt bn l dng in 220V. C th thay i gi tr in tr ca cun dy trong bn l nh th no dng in 110V m cng sut khng thay i: A. tng gp i B. tng 4 ln C. gim 2 ln D. gim 4 ln Cu hi 18: Hai bng n c cng sut nh mc l P1 = 25W, P2= 100W u lm vic bnh thng hiu in th 110V. So snh cng dng in qua mi bng v in tr ca chng: A. I1.>I2; R1 > R2 B. I1.>I2; R1 < R2 C. I1. R2 Cu hi 19: Hai bng n c cng sut nh mc l P1 = 25W, P2= 100W u lm vic bnh thng hiu in th 110V. Khi mc ni tip hai n ny vo hiu in th 220V th: A. n 1 sng yu, n 2 qu sng d chy C. c hai n sng yu B. n 2 sng yu, n 1qu sng d chy D. c hai n sng bnh thng

Cu hi 20: Hai in tr ging nhau mc ni tip vo ngun in hiu in th U th tng cng sut tiu th ca chng l 20W. Nu chng mc song song vo ngun ny th tng cng sut tiu th ca chng l: A. 5W Cu p n 11 C 12 A B. 40W 13 A 14 B C. 10W P N 15 16 C D 17 D D. 80W 18 D 19 B 20 D

2


Phm Th Hin THPT chuyn Lng Vn Ty Dng in khng i Dng 1: i cng v dng in, A, P- 3:Cu hi 21: Khi mt ti R ni vo ngun sut in ng v in tr trong r, thy cng sut mch ngoi cc i th: A. = IR B. r =R C. PR = I D. I = /r Cu hi 22: Mt ngun in c sut in ng = 12V in tr trong r = 2 ni vi in tr R to thnh mch kn. Xc nh R cng sut ta nhit trn R cc i, tnh cng sut cc i : A. R= 1, P = 16W C. R = 3, P = 17,3W B. R = 2, P = 18W D. R = 4, P = 21W

Cu hi 23: Mt ngun in c sut in ng = 12V in tr trong r = 2 ni vi in tr R to thnh mch kn. Xc nh R bit R > 2, cng sut mch ngoi l 16W: A. 3 B. 4 C. 5 D. 6 Cu hi 24: Mt ngun in c sut in ng = 12V in tr trong r = 2 ni vi in tr R to thnh mch kn. Tnh cng dng in v hiu sut ngun in, bit R > 2, cng sut mch ngoi l 16W: A. I = 1A. H = 54% C. I = 2A. H = 66,6% B. I = 1,2A, H = 76,6% D. I = 2,5A. H = 56,6%

Cu hi 25: Khi dng in chy qua on mch ngoi ni gia hai cc ca ngun in th cc ht mang in chuyn ng c hng di tc dng ca lc: A. Cu long B. hp dn C. lc l D. in trng Cu hi 26: Khi dng in chy qua ngun in th cc ht mang in chuyn ng c hng di tc dng ca lc: A. Cu long A. I = q.t B. hp dn B. I = q/t C. lc l C. I = t/q D. in trng D. I = q/e Cu hi 27: Cng dng in c biu thc nh ngha no sau y: Cu hi 28: Chn mt p n sai: A. cng dng in o bng ampe k B. o cng dng in phi mc ni tip ampe k vi mch C. dng in qua ampe k i vo cht dng, i ra cht m ca ampe k D. dng in qua ampe k i vo cht m, i ra cht dng ca ampe k Cu hi 29: n v ca cng dng in, sut in ng, in lng ln lt l: A. vn(V), ampe(A), ampe(A) C. Niutn(N), fara(F), vn(V) B. ampe(A), vn(V), cu lng (C) D. fara(F), vn/mt(V/m), jun(J)

Cu hi 30: Mt ngun in c sut in ng l , cng ca ngun l A, q l ln in tch dch chuyn qua ngun. Mi lin h gia chng l: A. A = q. B. q = A. C. = q.A P N 25 D D. A = q2.

Cu p n

21 B

22 B

23 B

24 C

26 C

27 B

28 D

29 B

30 A

3


Phm Th Hin THPT chuyn Lng Vn Ty Dng in khng i Dng 1: i cng v dng in, A, P- 4:Cu hi 31: Trong thi gian 4s mt in lng 1,5C chuyn qua tit din thng ca dy tc bng n. Cng dng in qua bng n l: A. 0,375A B. 2,66A C. 6A D. 3,75A Cu hi 32: Dng in qua mt dy dn kim loi c cng 2A. S electron dch chuyn qua tit din thng ca dy dn ny trong 2s l: A. 2,5.1018 B. 2,5.1019 C. 0,4. 1019 D. 4. 1019 Cu hi 33: Cng dng in chy qua tit din thng ca dy dn l 1,5A. Trong khong thi gian 3s th in lng chuyn qua tit din dy l: A. 0,5C B. 2C C. 4,5C D. 5,4C Cu hi 34: S electron dch chuyn qua tit din thng ca dy trong thi gian 2s l 6,25.10 18. Khi dng in qua dy dn c cng l: A. 1A B. 2A C. 0,512.10-37 A D. 0,5A Cu hi 35: Dng in chy qua bng n hnh ca mt ti vi thng dng c cng 60A. S electron ti p vo mn hnh ca tivi trong mi giy l: A. 3,75.1014 B. 7,35.1014 C. 2, 66.10-14 D. 0,266.10-4 Cu hi 36:Cng ca lc l lm di chuyn in tch 4C t cc m n cc dng bn trong ngun in l 24J. Sut in ng ca ngun l: A. 0,166V B. 6V C. 96V D. 0,6V Cu hi 37: Sut in ng ca mt cquy l 3V, lc l lm di chuyn in tch thc hin mt cng 6mJ. Lng in tch dch chuyn khi l: A. 18.10-3 C. B. 2.10-3C C. 0,5.10-3C D. 1,8.10-3C Cu hi 38: Cng dng in khng i chy qua on mch l I = 0,125A. Tnh in lng chuyn qua tit din thng ca mch trong 2 pht v s electron tng ng chuyn qua: A. 15C; 0,938.1020 Cu hi 39: Pin in ha c hai cc l: A. hai vt dn cng cht C. hai vt dn khc cht Cu hi 40: Pin vnta c cu to gm: A. hai cc bng km(Zn) nhng trong dung dch axit sunphuric long(H2SO4) B. hai cc bng ng (Cu) nhng trong dung dch axit sunphuric long(H2SO4) C. mt cc bng km(Zn) mt cc bng ng (Cu) nhng trong dung dch axit sunphuric long(H2SO4) D. mt cc bng km(Zn) mt cc bng ng (Cu) nhng trong dung dch mui B. hai vt cch in D. mt cc l vt dn, mt vt l in mi B. 30C; 0,938.1020 C. 15C; 18,76.1020 D. 30C;18,76.1020

Cu p n

31 A

32 B

33 C

34 D

P N 35 A

36 B

37 B

38 A

39 C

40 C

4


Phm Th Hin THPT chuyn Lng Vn Ty Dng in khng i Dng 1: i cng v dng in, A, P- 5:Cu hi 41: Hai cc ca pin Vnta tch in khc nhau l do: A. ion dng ca km i vo dung dch ca cht in phn B. ion dng H+ trong dung dch in phn ly electron ca cc ng C. cc electron ca ng di chuyn ti km qua dung dch in phn D. ion dng km i vo dung dch in phn v cc ion H+ ly electron ca cc ng Cu hi 42: Acquy ch gm: A. Hai bn cc bng ch nhng vo dung dch in phn l baz B. Bn dng bng PbO2 v bn m bng Pb nhng trong dung dch cht in phn l axit sunfuric long C. Bn dng bng PbO2 v bn m bng Pb nhng trong dung dch cht in phn l baz D. Bn dng bng Pb v bn m bng PbO2 nhng trong dung dch cht in phn l axit sunfuric long Cu hi 43: im khc nhau gia acquy ch v pin Vnta l: A. S dng dung dch in phn khc nhau B. s tch in khc nhau gia hai cc C. Cht dng lm hai cc ca chng khc nhau D. phn ng ha hc acquy c th sy ra thun nghch Cu hi 44: Trong ngun in ha hc (Pin v acquy) c s chuyn ha nng lng t: A. c nng thnh in nng C. ha nng thnh in nng B. ni nng thnh in nng D. quang nng thnh in nng

Cu hi 45: Mt pin Vnta c sut in ng 1,1V. Khi c mt lng in tch 27C dch chuyn bn trong gia hai cc ca pin th cng ca pin ny sn ra l: A. 2,97J B. 29,7J C. 0,04J D. 24,54J Cu hi 46: Mt b acquy c sut in ng 6V c dung lng l 15Ah. Acquy ny c th s dng thi gian bao lu cho ti khi phi np li, tnh in nng tng ng d tr trong acquy nu coi n cung cp dng in khng i 0,5A: A. 30h; 324kJ B. 15h; 162kJ C. 60h; 648kJ D. 22h; 489kJ Cu hi 47: Mch in gm in tr R = 2 mc thnh mch in kn vi ngun = 3V, r = 1 th cng sut tiu th mch ngoi R l: A. 2W B. 3W C. 18W D. 4,5W Cu hi 48: Mt ngun c = 3V, r = 1 ni vi in tr ngoi R = 1 thnh mch in kn. Cng sut ca ngun in l: A. 2,25W B. 3W C. 3,5W D. 4,5W Cu hi 49: Mt mch in kn gm ngun in sut in ng = 6V, in tr trong r = 1 ni vi mch ngoi l bin tr R, iu chnh R cng sut tiu th trn R t gi tr cc i. Cng sut l: A. 36W B. 9W C. 18W D. 24W Cu hi 50: Mt mch in kn gm ngun in sut in ng = 3V, in tr trong r = 1 ni vi mch ngoi l bin tr R, iu chnh R cng sut tiu th trn R t gi tr cc i. Khi R c gi tr l: A. 1 Cu p n 5 41 D 42 B 43 D B. 2 44 C P N 45 B C. 3 46 A 47 A 48 D 49 B D. 4 50 A


Phm Th Hin THPT chuyn Lng Vn Ty Dng in khng i Dng 2: on mch ch R - 1:Cu hi 1: Biu thc lin h gia hiu in th, cng dng in v in tr ca hai vt dn mc ni tip v mc song song c dng l: A. Ni tip B. Ni tip C. Ni tip D. Ni tip ; song song ; song song ; song song ; song song

Cu hi 2: Cc dng c in trong nh thng c mc ni tip hay song song, v sao? A. mc song song v nu 1 vt b hng, vt khc vn hot ng bnh thng v hiu in th nh mc cc vt bng hiu in th ca ngun B. mc ni tip v nu 1 vt b hng, cc vt khc vn hot ng bnh thng v cng nh mc ca cc vt lun bng nhau C. mc song song v cng dng in qua cc vt lun bng nhau v hiu in th nh mc ca cc vt bng hiu in th ca ngun D. mc ni tip nhau v hiu in th nh mc ca cc vt bng hiu in th ca ngun, v cng nh mc qua cc vt lun bng nhau Cu hi 3: Mt bng n in tr 87 mc vi mt ampe k c in tr 1. Hiu in th gia hai u on mch l 220V. Tm hiu in th gia hai u bng n: A. 220V B. 110V C. 217,5V D. 188V Cu hi 4: Gia hai u mng in c mc song song 3 dy dn in tr ln lt l R 1 = 4, R2 = 5, R3 = 20. Tm hiu in th hai u on mch nu cng dng in trong mch chnh l 2,2A: A. 8,8V B. 11V C. 63,8V D.4,4V Cu hi 5: Gia hai u mng in c mc song song 3 dy dn in tr ln lt l R 1 = 4, R2 = 5, R3 = 20. Tm cng dng in qua R1 nu cng dng in trong mch chnh l 5A: A. 1,5A B. 2,5A C. 2A D. 0,5A Cu hi 6: Mt hiu in th nh nhau mc vo hai loi mch: Mch 1 gm hai in tr ging nhau u bng R mc ni tip th dng in chy trong mch chnh l I1, mch 2 gm hai in tr ging nhau cng u bng R mc song song th dng in chy trong mch chnh l I2. Mi quan h gia I1 v I2 l: U 4 8 A. I1 = I2 B. I2 = 2I1 C. I2 = 4I1 D. I2 = 16I1 Cu hi 7: Cho mch in nh hnh v, quan h gia I v I1 l: I1 I A. I = I1/3 B. I = 1,5I1 C. I = 2I1 D. I = 3I1 Cu hi 8: Cho mch in nh hnh v. Nu R1 gim xung th: R1 R2 U A. gim th trn R2 gim B. dng in qua R1 l hng s C. dng in qua R1 tng D. cng sut tiu th trn R2 gim I1 I Cu hi 9: Cho mch in nh hnh v, R = 6, UAB = 30V. Cng dng in trong mch chnh v qua nhnh 2R ln lt l: R R R A. 2A, 1A B. 3A, 2A C. 2A; 0,67A D. 3A; 1A C D Cu hi 10: Cho mch in nh hnh v, R1 = 1, R2 = 2, R3 = 3, R4 = R 4,I1 = 2A, tnh UAB _ B A+ A. UAB = 10V B. UAB = 11,5V C.UAB = 12V D. UAB = 15,6VR3

C Cu p n 6 1 C 2 C 3 C 4 D P N 5 B 6 C 7 B 8 A

R2

R4

R1

D B 10 B_

9 D

A+


Phm Th Hin THPT chuyn Lng Vn Ty Dng in khng i Dng 2: on mch ch R - 2:Cu hi 11: Cho mch in nh hnh v, UAB = 30V, cc in tr ging nhau u bng 6.Cng dng in trong mch chnh v cng qua R 6 ln lt l: A. 10A; 0,5A B. 1,5A; 0,2A C. 15A; 1A D. 12A; 0,6A Cu hi 12:cho mch in nh hnh v. R1 = 10; R2 = R3 = 6; R4 = R5 = R6 = 2. Tnh RAB? A. 10 B. 6 C. 12 D. 14+

A R1R2

R4 R5 R6

_

B A R1 R2 R3

R3 R4 R5

+

Cu hi 13: bi nh cu 12. Bit cng dng in qua R4 l 2A. Tnh UAB: _B A. 36V B. 72V C. 90V D. 18V Cu hi 14: Cho mch in mc nh hnh v. Nu mc vo AB hiu in th UAB = 100V th UCD = 60V, I2 = 1A. Nu mc vo CD: UCD = 120V th UAB = 90V. Tnh R1, R2, R3: A. R1 = 120; R2 = 60; R3 = 40 B. R1 = 120; R2 = 40; R3 = 60 C. R1 = 90; R2 = 40; R3 = 60 D. R1 = 180; R2 = 60; R3 = 90 Cu hi 15: Cho mch in nh hnh v. Nu mc vo AB:U AB = 120V th UCD = 30V v A I3 = 2A. Nu mc vo CD: UCD = 120V th UAB = 20V. Tnh R1, R2, R3: A. R1 = 12; R2 = 40; R3 = 20 B. R1 = 6; R2 = 30; R3 = 15 B C.R1 = 9; R2 = 40; R3 = 30 D. R1 = 18; R2 = 10; R3 = 15 Cu hi 16: Cho mch in nh hnh v. UAB = 20V, R1 = 2, R2 = 1, R3 = 6, R4 = 4,K m; tnh cng dng in qua cc in tr: A. I1 = 1,5A; I2 = 3A B. I1 = 2,5A; I2 = 4A C.I1 = 3A; I2 = 5A D.I1 = 3,5A; I2 = 6A

R6 A R1 B R2 C R3 D C R2 R3 D

R1

R2

R1 R2 A+ K-B

R3 R4

Cu hi 17: bi ging cu 16. Kha K ng. Tnh cng dng in qua R1 v R2 bit K khng in tr : A. I1 = 1,8A; I2 = 3,61A C. I1 = 2,16A; I2 = 4,33A A. 9 A. 36A B. 3 B 6A B. I1 = 1,9A; I2 = 3,82A D.I1 = 2,35A; I2 = 5,16A C. 6 C. 1A D. 12 D. 12A

Cu hi 18: Mt bng n ghi 3V 3W khi n sng bnh thng in tr n c gi tr l: Cu hi 19: Mt bng n ghi 6V 6W mc vo hiu in th 6V th cng dng in qua bng l: Cu hi 20: bng n 120V 60W sng bnh thng mng in c hiu in th 220V ngi ta phi mc ni tip vi n mt mt in tr R c gi tr l: A. 410 B 80 C. 200 D. 100

Cu p n

11 C

12 C

13 B

14 B

P N 15 B

16 B

17 C

18 B

19 C

20 C

7


Phm Th Hin THPT chuyn Lng Vn Ty Dng in khng i Dng 2: on mch ch R - 3:Cu hi 21: Cho mch in nh hnh v. R1 = 3, R2 = 2, R3 = 3, UAB = 12V. Tnh Rx cng dng in qua ampe k bng khng: A. Rx = 4 B.Rx = 5 C. Rx = 6 D. Rx = 7R1 R2 A+-B

A

R3 Rx

Cu hi 22: Cho mch in nh hnh v cu hi 21. R1 = 3, R2 = 2, R3 = 3, UAB = 12V.Rx = 1. Tnh cng dng in qua ampe k, coi ampe k c in tr khng ng k A. 0,5A B. 0,75A C. 1A D. 1,25A Cu hi 23: Cho mch in nh hnh v cu hi 21, thay ampe k bng vn k, R 1 = 3, R2 = 2, R3 = 1, UAB = 12V. Tnh Rx vn k ch s khng: A. 2/3 B. 1 C. 2 D. 3 Cu hi 24: Cho mch in nh hnh v cu hi 21, thay ampe k bng vn k, R 1 = 3, R2 = 2, R3 = 1, UAB = 12V. Vn k ch 2V, cc dng mc vo im M, coi in tr vn k rt ln. Tnh Rx: A. 0,1 B. 0,18 C. 1,4 D. 0,28R1 R2 A+ V K-B

Cu hi 25: Cho mch in nh hnh v. R1 = 1, R2 = 3, Rv = , UAB = 12V. Kha K m, vn k ch 2V. Tnh R3? A. 2 B3 C. 4 D. 5

R3 R4

Cu hi 26: Cho mch in nh hnh v cu hi 25. R 1 = 1, R2 = 3, Rv = , R3 = 5. Kha K ng, vn k ch s khng. Tnh R4? A. 11 B13 C. 15 D. 17R1 R2 A+-B

Cu hi 27: Cho mch in nh hnh v. R1 = 1, R2 = 3, Rv = , UAB = 12V. Kha K ng, vn k ch 1V. Tnh R4? A. 9 hoc 33 B.9 hoc 18 C. 18 hoc 33 D. 12 hoc 24

V

R3 R4

Cu hi 28: Mt ampe k c in tr bng 9 ch cho dng in ti a l 0,1A i qua. Mun mc vo mch in c dng in chy trong nhnh chnh l 5A m ampe k hot ng bnh thng khng b hng th phi mc song song vi n in tr R l: A. 0,1 B. 0,12 C. 0,16 D. 0,18 Cu hi 29: Mt vn k c in tr 10K c th o c ti a hiu in th 120V. Mun mc vo mch in c hiu in th 240V phi mc ni tip vi n mt in tr R l: A. 5K B. 10K C. 15 K D. 20K Cu hi 30: Mt ampe k c in tr bng 2 ch cho dng in ti a l 10mA i qua. Mun mc vo mch in c dng in chy trong nhnh chnh l 50mA m ampe k hot ng bnh thng khng b hng th phi mc vi n in tr R: A. nh hn 2 song song vi ampe k B. ln hn 2 song song vi ampe k C. nh hn 2 ni tip vi ampe k Cu p n 21 C 22 B 23 A 24 B P N 25 D 26 C D. ln hn 2 ni tip vi ampe k 27 A 28 D 29 B 30 A

8


Phm Th Hin THPT chuyn Lng Vn Ty Dng in khng i Dng 2: on mch ch R - 4:Cu hi 31: Cho mch in nh hnh v, vn k in tr rt ln, R1 = 3, R2 = 2, R3 = 1, UAB = 12V. Vn k ch 3V, cc dng mc vo im N. Tnh Rx: A. 0,8 B. 1,18 C. 2 D. 2,28R1 R2 A+-B

V

R3 Rx

Cu hi 32: Mt vn k c in tr Rv o c hiu in th ti a l 50mV. Mun mc vo mch c hiu in th 20V m vn k khng b hng ngi ta ni vi vn k in tr R: A. nh hn Rv rt nhiu, song song vi vn k B. ln hn Rv rt nhiu, song song vi vn k C. nh hn Rv rt nhiu, ni tip vi vn k D. ln hn Rv rt nhiu, ni tip vi vn k Cu hi 33: bn in tr ging nhau mc ni tip v ni vo mng in c hiu in th khng i UAB = 132V: Dng vn k c in tr RV khi ni vo A, C vn k ch 44V. R R R R B D A C Hi khi vn k ni vo A, D n s ch bao nhiu: + A. 12V B. 20V C. 24V D. 36V Cu hi 34: Cho mch in nh hnh v. UAB = 120V, hai vn k c in tr rt ln, R2 R1 R1 c in tr rt nh so vi R2. S ch ca cc vn k l: A.U1 = 10V; U2 = 110V B. U1 = 60V; U2 = 60V V V 1 2 C.U1 = 120V; U2 = 0V D.U1 = 0V; U2 = 120VA+-B

Cu hi 35: Mt in k c th o c dng in ti a l 10mA dng lm vn k c th o ti a 25V, th ngi ta s dng thm: A. in tr nh hn 2 mc song song vi in k B. in tr ln hn 2 mc song song vi in k C. in tr nh hn 2 mc ni tip vi in k D. in tr ln hn 2 mc ni tip vi in k Cu hi 36: Mt in k c in tr 1, o c dng in ti a 50mA. Phi lm th no s dng in k ny lm ampe k o cng dng in ti a 2,5A: A. Mc song song vi in k mt in tr 0,2 B. Mc ni tip vi in k mt in tr 4 C. Mc ni tip vi in k mt in tr 20 D. Mc song song vi in k mt in tr 0,02 Cu hi 37:Mt in k c in tr 2, trn in k c 100 chia, mi chia c gi tr 0,05mA. Mun dng in k lm vn k o hiu in th cc i 120V th phi lm th no: A. Mc song song vi in k in tr 23998 B. Mc ni tip vi in k in tr 23998 C. Mc ni tip vi in k in tr 11999 D. Mc song song vi in k in tr 11999 Cu hi 38: Mt in k c in tr 24,5 o c dng in ti a l 0,01A v c 50 chia. Mun chuyn in k thnh ampe k m mi chia ng vi 0,1A th phi mc song song vi in k mt in tr: A. 0,1 B. 0,3 C. 0,5 D. 0,7 Cu hi 39:Mt vn k c in tr 12K o c hiu in th ln nht 110V. Nu mc vn k vi in tr 24K th vn k o c hiu in th ln nht l bao nhiu: A. 165V B. 220V C. 330V D. 440V Cu hi 40: Mt ampe k c in tr 0,49 o c dng in ln nht l 5A. Ngi ta mc thm in tr 0,245 song song vi ampe k trn tr thnh h thng c th o c dng in ln nht bng bao nhiu: A. 10A Cu p n 31 C 32 D B. 12,5A 33 C 34 D C. 15A P N 35 36 D D D. 20A 37 B 38 C 39 C 40 B

9


Phm Th Hin THPT chuyn Lng Vn Ty Dng in khng i Dng 3: nh lut m cho ton mch - 1:Cu hi 1: Cng thc no l nh lut m cho mch in kn gm mt ngun in v mt in tr ngoi: A. I = B. UAB = Ir C. UAB = + Ir D. UAB = IAB(R + r) I1 R I2 I3 2R

Cu hi 2: Cho mch in nh hnh v. Biu thc no sau y ng: A. I1 = B. I3 = 2I2 C. I2R = 2I3R D. I2 = I1 + I3

Cu hi 3: Mt ngun in c in tr trong 0,1 mc thnh mch kn vi in tr 4,8. Khi hiu in th gia hai cc ngun in l 12V. Tnh sut in ng ca ngun v cng dng in trong mch: 100 A. 2,49A; 12,2V A. 1V B. 2,5A; 12,25V B. 2V C. 3V C. 2,6A; 12,74V D. 6V D. 2,9A; 14,2V100V

Cu hi 4: Cho mch in nh hnh v. S ch ca vn k l: = 6V

Cu hi 5: Nu l sut in ng ca ngun in v In l dng ngn mch khi hai cc ngun ni vi nhau bng dy dn khng in tr th in tr trong ca ngun c tnh: A. r = /2In B. r = 2/In C. r = /In D. r = In/ Cu hi 6: Mt ngun in mc vi mt bin tr. Khi in tr ca bin tr l 1,65 th hiu in th hai cc ngun l 3,3V; khi in tr ca bin tr l 3,5 th hiu in th hai cc ngun l 3,5V. Tm sut in ng v in tr trong ca ngun: A. 3,7V; 0,2 B.3,4V; 0,1 C.6,8V;1,95 D. 3,6V; 0,15A , r1 , r2 B

Cu hi 7: Cho mch in nh hnh v. Hai pin c sut in ng bng nhau v bng 6V, r1 = 1, r2 = 2. Tnh cng dng in trong mch v hiu in th gia hai im A v B: A. 1A; 3V B. 2A; 4V C. 3A; 1V D. 4A; 2VA

, r1 , r2 B

Cu hi 8: Cho mch in nh hnh v. Hai pin c sut in ng bng nhau v bng 2V, r1 = 1, r2 = 3. Tnh cng dng in trong mch v hiu in th gia hai im A v B: A. 0,5A; 1V B. 1A; 1V C. 0A; 2V D. 1A; 2V

1 , r1

Cu hi 9: Cho mch in nh hnh v. Hai pin c sut in ng 1 = 6V, 2 = 3V, r1 = 1, r2 = 2. Tnh cng dng in trong mch v hiu in th gia hai im A v B: A. 1A; 5V B. 0,8A; 4V C. 0,6A; 3V D. 1A; 2V Cu hi 10: Tm sut in ng v in tr trong ca b ngun gm 6 cquy mc nh hnh v. Bit mi cquy c = 2V; r = 1: A. 12V; 3 B. 6V; 3 C. 12V; 1,5 D. 6V; 1,5A

A

2 , r 2

B

B

Cu p n 10

1 A

2 B

3 B

4 B

P N 5 C

6 A

7 D

8 D

9 A

10 D


Phm Th Hin THPT chuyn Lng Vn Ty Dng in khng i Dng 3: nh lut m cho ton mch - 2:Cu hi 11: Cho mch in nh hnh v. Mi pin c = 1,5V; r = 1. in tr mch ngoi R = 3,5. Tm cng dng in mch ngoi: A. 0,88A B. 0,9A C. 1A D. 1,2AA R 1 , r 1 2 , r2 B

Cu hi 12: Cho mch in nh hnh v. Hai pin c sut in ng 1 = 12V, 2 = 6V, r1 = 3, r2 = 5. Tnh cng dng in trong mch v hiu in th gia hai im A v B: A. 1A; 5V B. 2A; 8V C. 3A; 9V D. 0,75A; 9,75V Cu hi 13: Cho mch in nh hnh v. Mi pin c = 1,5V; r = 1. Cng dng in mch ngoi l 0,5A. in tr R l: A. 20 B. 8 C. 10 D. 12A R2 R4 R1

AC A D

R

B

R3 R5 B

Cu hi 14: Cho mch in nh hnh v. Bit = 6V, r = 0,5, R1 = R2 = 2, R3 = R5 = 4, R4 = 6. in tr ca ampe k v dy ni khng ng k. Tm s ch ca ampe k: A. 0,25A B. 0,5A C. 0,75A D. 1A Cu hi 15: Cho mch in nh hnh v. Khi dng in qua in tr R5 bng khng th: A. R1/ R2 = R3/ R4 C. R1R4 = R3R2 B. R4/ R3 = R1/ R2 D. C A v C u ngA

C R1 R3 D R5 R2 R4B

Cu hi 16: Cho mch in nh hnh v cu hi 14. Bit = 6V, r = 0,5, R1 = R2 = 2; R3 = R5 = 4, R4 = 6. in tr ampe k khng ng k. Cng dng in trong mch chnh l: A. 0,5A B. 1A C. 1,5A D. 2A Cu hi 17: Cho mch in nh hnh v cu hi 14. Bit = 6V, r = 0,5, R 1 = R2 = 2,R3 = R5 = 4, R4 = 6. in tr ampe k khng ng k. Hiu in th gia hai cc ca ngun in l: A. 1,5V B. 2,5V C. 4,5V D. 5,5V, r R1 C 1 2 R2 B

Cu hi 18: Cho mch in nh hnh v. Bit = 6,6V; r = 0,12, 1: 6V 3W; 2: 2,5V 1,25W. iu chnh R1 v R2 sao cho 2 n sng bnh thng. Tnh gi tr ca R2:A A. 5 B. 6 C. 7 D. 8

Cu hi 19: Cho mch in nh hnh v cu hi 18. Bit = 6,6V; r = 0,12, 1: 6V 3W; 2: 2,5V 1,25W. iu chnh R1 v R2 sao cho 2 n sng bnh thng. Tnh gi tr ca R1: A. 0,24 B. 0,36 C. 0,48 D. 0,56 Cu hi 20: Mc vn k V1 c in tr R1 vo hai cc ngun in (e,r) th vn k ch 8V. Mc thm vn k V2 c in tr R2 ni tip vi V1 vo hai cc ngun th V1 ch 6V v V2 ch 3V. Tnh sut in ng ca ngun: A. 10V Cu p n 11 C 12 D B. 11V 13 C 14 A C. 12V P N 15 16 D B 17 D D. 16V 18 C 19 C 20 C

11


Phm Th Hin THPT chuyn Lng Vn Ty Dng in khng i Dng 3: nh lut m cho ton mch - 3:Cu hi 21: Trong mt mch in kn nu mch ngoi thun in tr R N th hiu sut ca ngun in c in tr r c tnh bi biu thc: A. H = B. H = C.H = D. H =R A , r

Cu hi 22: Cho mch in nh hnh v, b qua cc in tr dy ni v ampe k, = 3V, r = 1, ampe k ch 0,5A. Gi tr ca in tr R l: A. 1 B. 2 C. 5 D. 3

Cu hi 23: Cc pin ging nhau c sut in ng 0, in tr trong r0 mc hn hp i xng gm n dy, mi dy c m ngun mc ni tip. B ngun ny mc vi in tr ngoi R th cng dng in qua in tr R l: A. I = B. I = C. I = D. I =

Cu hi 24: C n ngun ging nhau cng sut in ng e, in tr trong r mc ni tip vi nhau ri mc thnh mch kn vi R. Cng dng in qua R l: A. I = B. I = C. I = D. I =

Cu hi 25: C n ngun ging nhau cng sut in ng e, in tr trong r mc song song vi nhau ri mc thnh mch kn vi R. Cng dng in qua R l: A. I = B. I = C. I = D. I =1, r1 A R 2, r2

Cu hi 26: Cho mch in nh hnh v. B qua in tr ca dy ni v ampe k, bit 1 = 3V, r1 = 1, 2 = 6V, r2 = 1, R = 2,5. Ampe k ch: A. 2A B. 0,666A C. 2,57A D. 4,5A Cu hi 27: Cho mch in nh hnh v. B qua in tr ca dy ni v ampe k, = 30V, r = 3, R1 = 12, R2 = 36, R3 = 18. Xc nh s ch ampe k: A. 0,741A B. 0,654A C. 0,5A D. 1A Cu hi 28: Cho mch in nh hnh v. B qua in tr ca dy ni v ampe k, = 30V, r = 3, R1 = 12, R2 = 36, R3 = 18. Xc nh s ch ampe k: A. 0,75A B. 0,65A C. 0,5A D. 1A

R1 M , r

R2

A

R3 N

, r R1 M R2 R3 N

A Cu hi 29: Khi mt ti R ni vo ngun c sut in ng , in tr trong r m cng sut mch ngoi cc i th: A. IR = B. r = R C. PR = .I D. I = /rR2 V

Cu hi 30: Cho mch in nh hnh v. R1 = R2 = RV = 50, = 3V, r = 0. B qua in tr dy ni, s ch vn k l: A. 0,5V Cu p n 12 21 C 22 C B. 1V 23 C 24 C C. 1,5V P N 25 26 D A 27 A D. 2V 28 A

R1

29 B

30 B


Phm Th Hin THPT chuyn Lng Vn Ty Dng in khng i Dng 4: nh lut m cho cc on mch - 1:Cu hi 1: Cho mch in nh hnh v. Phng trnh no din t ng mi quan h gia cc cng dng in: A. I1 + I6 = I5 B. I1 + I2 = I3 C. I1 + I4 = I5 D. I1 + I2 = I5 +I6I5 I4

4 2 3

I1 I2

12V 10VI3

I6 5

6

Cu hi 2: Cho mch in nh hnh v cu hi 1. Phng trnh no din t ng mi quan h gia cc cng dng in: A. 4I1 + 2I5 + 6I3 = 10 C. 3I4 - 4I1 = 2 B. 3I4 + 2I5 5I6 = 12 D. 4I1 + 2I5 + 6I3 = 0A 1, r1 2, r2 R B

Cu hi 3: Cho mch in nh hnh v. 1 = 6V, r1 = 1, 2 = 3V, r2 = 2. Vi gi tr no ca R th 2 khng pht khng thu: A. R < 2 B. R > 2 C. R < 1 D. R = 1

Cu hi 4: Cho mch in nh hnh v cu hi 3. 1 = 6, r1 = 1, 2 = 3V, r2 = 2.Vi gi tr no ca R th 2 thu in: A. R < 2 B. R > 1 C. R < 1 D. R > 21, r1 N R1

Cu hi 5: Cho mch in nh hnh v. 1 = 2 = 6V, r1 = 1, r2 = 2, R1 = 5, R2 = 4, vn k c in tr rt ln ch 7,5V. Tnh UAB: A. 6V B. 4,5V C. 9V D. 3V Cu hi 6: Cho mch in nh hnh v cu hi 5. 1 = 2 = 6V, r1 = 1, r2 = 2, R1 = 5, R2 = 4, vn k c in tr rt ln ch 7,5V. Tnh R: A. 4,5 B. 7,5 C. 6 B. UAB = - I(R +r) D. 3 Cu hi 7: Cho on mch nh hnh v. Hiu in th gia hai im A v B c biu thc l: A. UAB = + I(R +r) C. UAB = I(R +r) - A R2 R

V r 2, 2 M

B

A

I , r

R

B

D. UAB = - I(R +r) - A I , r R B

Cu hi 8: Cho on mch nh hnh v. Hiu in th gia hai im A v B c biu thc l: A. UAB = - I(R +r) B. UAB = - I(R +r) - C. UAB = + I(R +r)

D. UAB = I(R +r) - 1, r1 A B

Cu hi 9: Cho mch in nh hnh v. 1 = 6V, r1 = 1, 2 = 3V, r2 = 3, R = 3. Tnh UAB: A. 3,6V B. 4V C. 4,2V D. 4,8V

2, r2 R

Cu hi 10: Cho mch in nh hnh v cu hi 9. 1 = 6, r1 = 1, 2 = 3V, r2 = 2. Vi gi tr no ca R th 2 pht in: A. R < 2 Cu p n 13 1 C 2 C B. R > 2 3 D 4 B C. R < 1 P N 5 D 6 D D. R > 1 7 A 8 A 9 C 10 C


Phm Th Hin THPT chuyn Lng Vn Ty Dng in khng i Dng 4: nh lut m cho cc on mch - 2:Cu hi 11: Mt b c quy c np in vi cng dng in np l 3A v hiu in th t vo hai cc ca b cquy l 12V. Xc nh in tr trong ca b cquy, bit b cquy c = 6V: A. 1 B. 2 C. 3 D. 4 Cu hi 12: Mt b c quy c np in vi cng dng in np l 5A v hiu in th t vo hai cc ca b cquy l 32V. Xc nh in tr trong ca b cquy, bit b cquy c = 16V: 1 , r1 A. 1,2 B. 2,2 C. 3,2 D. 4,2A C A 1 , r1 A C A B B

Cu hi 13: Cho mch in nh hnh v. 1 = 4,5V; r1 = 1, 2 = 1,8V, RAB = 8, RA = 0. Tm gi tr ca in tr on AC ampe k ch s khng: A. 1,2 B. 2,4 C. 3,6 D. 4,8 Cu hi 14: Cho mch in nh hnh v. 1 = 4,5V; r1 = 1, 2 = 1,8V, RAB = 8, RA = 0, R = 3. Tm gi tr ca in tr on AC ampe k ch s khng: A. 3 B. 4 C. 6 D. 8 Cu hi 15: Cho mch in nh hnh v. 1 = 6V; r1 = 2, 2 = 4,5V, r2 = 0,5, RA = 0, R = 2. Tm s ch ca ampe k: A. 0,5A B. 1A C. 1,5A D. 2A

2 , r2

2 , r2 R

1 , r1 R A 2 , r2

Cu hi 16:Mt b ngun gm hai ngun 1; r1; 2, r2 khc nhau mc song song vi nhau ri mc vi mch ngoi. Hiu in th hai u b hai ngun trn c biu thc: A. U = 1 + 2 B. 1/U = 1/1 + 1/2 C. U = |1 - 2 | D. U =

Cu hi 17: Mt b ngun gm hai ngun 1; r1; 2, r2 khc nhau mc song song vi nhau ri mc vi mch ngoi. in tr trong ca b ngun c biu thc: A. rb = r1 + r2 B. rb = C. rb = |r1 - r2 | D. rb = Cu hi 18: Ba ngun in ging nhau mi ngun c e = 3V, r = 1 mc nh hnh v. Hiu in th UAB bng: A. 8/3V B.4/3V C. 0V D. 5/3V Cu hi 19: Ba ngun in ging nhau mi ngun c e = 3V, r = 1 mc nh hnh v. Hiu in th UAB bng: A. 8/3V B. 4/3V C. 0V D. 5/3V Cu hi 20: Ba ngun in ging nhau mi ngun c e = 3V, r = 1 mc nh hnh v. Hiu in th UAB bng: A. 8/3V B.4/3V C. 0V D. 5/3V Cu p n 14 11 B 12 C 13 C 14 C P N 15 16 D D 17 B 18 AA B

A

B

A

B

19 B

20 C


Phm Th Hin THPT chuyn Lng Vn Tys

15


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2. Dong Dien Khong Doi 11.10545