, N TP HC K 1 r 1.C 40 pin ging nhau, ghp thnh 4 dy. Mi pin c = 3V , r = 0, 2 . Hy tnh sut in ng v R in tr trong ca b ngun. R 2 2.Cho mch in c s nh hnh v1. Cho = 6V , r = 1 , R1 = 3 , R2=10 , R3 =15 . Tnh cng R I 1 dng in qua mch. 3.Mt vt kim loi c m niken c din tch S = 0,150m 2. Dng in chy qua bnh in phn c cng 3 0,3A. Thi gian m l t=2gi. Tnh dy ca lp niken ph trn mt c m. Cho bit niken c khi lng mol nguyn t l A = 58,7, ho tr n = 2 v khi lng ring = 8,9.103 kg/m3. 4.Mt qut in hot ng hiu in th 220V th cng dng in chy qua n l 5A. Tnh cng sut ca qut in v in nng tiu th ca qut in trong 1 gi. 5.Cho mch in c s nh hnh v2, trong ngun in c sut in ng v c in tr trong r = 1 , cc in tr mch ngoi l R1 = 3 , R2 = 6 v R3 = 1 , ampe k ch I = 1,5 A. B qua in tr ca cc on dy ni v in tr ampe k.a. Tnh in tr tng ng ca mch ngoi. + b. Tnh sut in ng ca ngun. c. Tnh nhit lng ta ra trn in tr R3 trong thi gian 5. d. Tnh cng sut tiu th trn in tr R2. 6.Cho mch in nh hnh v3: E1=18V, r1 =4 ; E2=10,8V, r2 =2,4 , R1 =1 , R2 =3 , C = 2F. Tnh s ch ca ampek v in tch trn t C. Bit RA =2 (1) 7.Cho mch in nh hnh v4. b=12V , rb=1 , R1=1 , R2=2 . R3 thay i c. a. Tm R3 cng sut trn R3 t 7,2W. b, b. Tm R3 cng sut tiu th trn R3 l ln nht. Tm cng sut ln nht . rb 8.Chiu di ca tm niken ph ln mt tm kim loi l d=0,05mm. Sau khi in phn 30pht Bit din tch mt ph tm kim loi l 30cm2, khi lng ring =8,9.103kg/m3, A=54g/mol v n=2. Tm cng chy qua bnh in phn. 9.Cho mch in nh hnh v 5, trong : = 24 V, r = 1 , R1 = 1 , R2 = 4 , R3 = 3 , R4 = 8 . a. Tnh cng dng in I trong mch chnh v hiu in th U2 hai u R2? b. Tnh hiu in th UMN gia hai im M, N? c. Nu ni MN bng mt t in C = 6F th in tch ca t l bao nhiu? Bn no tch in dng? 10.Cho mch in nh hnh v 6, trong : 1 = 3 V, r1 = 2 , 2 = 1,5 V, r2 = 1 , R1 = 6 , R2 = 12 , R3 = 36 . a. Tnh sut in ng b, in tr trong rb ca b ngun v cng dng in I trong mch chnh? b. Cng sut P3 trn in tr R3? Tnh hiu in th U2 hai u R2? c. Tnh cng ca ngun 1 thc hin trong 15 pht v hiu sut Hng ca b ngun? 11. Cho mch in nh hnh v7. , Bit ngun in c = 12V, r = 0,1 . R2 = 2 , R3 = 4 , R4 = 4,4 . R1 l mt bin tr. r D 1. Khi R1 = 2 , tnh: a. in tr tng ng ca mch ngoi. R4 R1 b. Cng dng in trong mch chnh v UCD. 2. iu chnh R1 c gi tr bao nhiu cng sut tiu th trn on mch AB l ln nht v tnh C cng sut . A R2 C R3 B R2 R3 12. Cho mch in c s nh hnh v8: A B A E = 6V, r = 0,5 R1 = R2 = 2 R3 = R5 = 4 R4 = 6 D R5 R4 in tr ca Ampe k v cc dy dn khng ng k. a. Tm cng dng in qua cc in tr. b. S ch ca Ampe k? R1 E, r 13. Cho mch in nh hnh v9. E ;r E ;r

-

1 1

2

2

B + R31

Cc ngun c E = 20V;r = 1 , E = 8V;r2 = 1 . 1 1 2

+ I1 I3 R1

Cc in tr

R1 = 3;R2 = 12;R3 = R 4 = 6

.

R2 C

R1 R4

2

B qua in tr ca cc dy ni v ampe k a. Tnh cng dng in qua mch chnh.

A

R3 A

B

D

b. Tnh s ch ampe k. 14. Cho mch in nh hnh v 10 : A 1 = 2,1 (V), 2 = 1,9 (V); R1 = R2 = 10( ), R3 = R2 45( ). Cc in tr trong ca ngun khng ng k.Tnh dng in qua cc in tr R1, R2, R3. 15. Mch in nh hnh v11: E = 8V; r = 8 R1 = 3 ; R2 = 6 . a. Xc nh Rx cng sut mch ngoi ln nht. b. Tnh cng sut ln nht .

1) Cho mch in c s nh hnh v. = 48V, r = 2 , R1 = 2 , R2 = 8 , R3 = 6 , R4 = 16 . in tr ca cc dy ni khng ng k. a. Tm in tr tng ng mch ngoi. Cng dng in ca mch chnh v cng dng in qua cc in tr. R1 R3 M b. o hiu in th UMN ta cn mc cc dng ca vn k vo , B im no? A r R2 R4 c. Nu mc gia M, N mt t in c in dung C = 2F khi N t tch c in tch bao nhiu ? + d. Nu mc gia M,N mt ampe k th ampe k ch bao nhiu ? Xc nh chiu dng in qua ampe k. R1 2) Cho mch in nh hnh v: R2 ,r = 12V; r = 0,5 ; R3 = 6 . n c in tr R2 v trn n ghi: R4 3V 3W.Bnh in phn c in tr R4 = 4 v in phn dung dch AgNO3 vi dng cc tan. R3 a) Bit rng sau khi in phn 32 pht 10 giy c 2,592g bc bm vo m cc. Tm cng dng in qua bnh in phn v cng sut to nhit trn bnh in phn? (Bc c A = 108 v n = 1). b b) Tm cng dng in chy trong mch? Tm hiu in th mch ngoi? c)Chng minh rng n sng m hn so vi sng bnh thng. d) Tm R1? rb 3) Cho mch in nh hnh v. B ngun in gm 8 pin ging nhau c ghp hn hp i xng thnh 2 dy song song mi dy c 4 pin. Mi pin c sut in ng o = 6V v in tr R R trong ro = 2.R = 6 l bnh in phn (AgNO3 - Ag). Cho Ag = 108, n = 1.R1 = 4, R2 = 4 . a/ Tnh sut in ng v in tr trong ca b ngun. 1 A B b/ Tnh in tr tng ng mch ngoi. c/ Tnh khi lng Ag tan ra cc dng ca bnh in phn sau 16 pht 5 giy v hiu sut ca R b ngun in. 4) Cho mch in nh hnh v :B ngun gm 2 dy , mi dy gm 10 pin ging ht nhau mc 2 ni tip.Mi pin c sut in ng =1,2 V v in tr trong l r = 0,2 .R1= 2 l bnh in phn ng dung dch CuSO4 c cc in cc bng ng, R2 = 4 , R3 = 6 , R4 l n lai (6V - 6W ) a) Tnh sut in ng v in tr trong ca b ngun . R1 R2 b) Tnh in tr tng ng mch ngoi v cng dng in chy qua mi dng c mch ngoi. c) -n c sng bnh thng khng ?-Tnh khi lng ng bm catt trong 16 pht 5 giy B A d) Tnh cng sut v hiu sut ca b ngun. 5) Cho mch in nh hnh v. Hai pin ging nhau mi pin c sut in ng = 3V, in R3 RR4 tr trong r = 0,5 .R1 = 4 , R2 = 8 , R3 = 2 . Ampe k c in tr RA nh khng I34 R3 C 4 ng k v ch 1,2A. Tnh. a.Hiu in th UAB v cng dng in I12, I34. b.in tr R4 v UCD c.Vi R4 l mt bnh in phn ng dung dch PbSO4 c in cc bng Pb. Tnh khi lng R2 I12 R1 Pb gii phng ant bm vo catt trong khong thi gian 16 pht 5giay. B A 6) Cho mch in nh hnh : B ngun gm 8 pin ging nhau, c mc thnh 2 dy, mi dy I A gm 4 pin ni tip, mi pin c 0 = 2,5 (V), r0 = 0,5 ( ). Mch ngoi gm: R1 =12 ( ), R2 D = 8 ( ), R3 = 1 ( ) l in tr ca bnh in phn ng dung dch AgNO3, anod bng Ag. R4 l n (4V 4W). B qua in tr cc dy ni. ,r ,r a/ Tnh sut in ng v in tr trong ca b ngun ? cng dng in trong mch chnh ? Cng dng in chy qua cc in tr mch ngoi. Hiu in th gia A v B ? b/ Tnh cng sut v hiu sut ca b ngun ? c/ Tnh khi lng Ag thu c catod bnh in phn sau 32 pht 10 giy ? n c sng bnh thng R2 R1 khng ? B A 7): Ngi ta ien phan dung dch muoi kim loai vi dong ien I = 2,5A trong thi gian 32 phut 10 giay va thu c 5,4g kim loai co hoa tr 1 R4 R3 X catot. Tm khoi lng mol A cua kim loai o. Hoi kim loai o la kim loai g? 8): Ngi ta dung mot nguon ien co suat ien ong la E = 12V e cung cap nang lng cho mach kn, khi o hieu suat cua nguon la 90%. Tnh hieu ien the gia hai cc cua nguon. 9): Mot thanh kim loai co ien tr 10 nhiet o 200C. Hoi ien tr cua no nhiet o 400C la bao nhieu? Biet he so nhiet ien tr la = 4.10-3 K-1. 10). Mt ngun gm 30 pin mc thnh 3 nhm ni tip, mi nhm c 10 pin mc song song, mi pin c sut in ng 0,9 (V) v in tr trong 0,6 (). Bnh in phn dung dch CuSO4 c in tr 205 mc vo hai cc ca b ngun. Trong thi gian 50 pht khi lng ng Cu bm vo catt l: A. 0,013 g B. 0,13 g C. 1,3 g D. 13 g 11). Mt bnh in phn ng dung dch bc nitrat vi ant bng bc. in tr ca bnh in phn l R= 2 ( ). Hiu in th t vo hai cc l U= 10 (V). Cho A= 108 v n=1. Khi lng bc bm vo cc m sau 2 gi l: A. 40,3g B. 40,3 kg C. 8,04 g D. 8,04.10-2 kg 12). gii phng lng clo v hir t 7,6g axit clohiric bng dng in 5A, th phi cn thi gian in phn l bao lu? Bit rng ng lng in ha ca hir v clo ln lt l: k1 = 0,1045.10-7kg/C v k2 = 3,67.10-7kg/C A. 1,5 h B. 1,3 h C. 1,1 h D. 1,0 h