1 Kim tra o lng (1tit)

Cc bi tp Do luongChng 2

Bi 1.

Mt c cu o t in c 3 in tr Sun s dng lm Ampemet. Ba in tr c:

R1 = 0,005 , R2 = 0,45 , R3 = 4,5 . C cu c Rcc = 1k, Icc = 50 A.

Hy v mch o v tnh gi tr ln nht ca Ampemet ti cc thang khc nhau .

Bi 2.

Tnh cc in tr ph R1, R2, R3, R4, R5. nh hnh v. Bit Rcc = 2k, Icc = 50 A.

Bi 3.Cho mt miliampemet t in c thang o 150 vch, vi gi tr chia CI = 0,2 mA/vch. in tr Rcc = 2 . Tnh gi tr in tr Sun tng ng o dng in 5 A, 10A, 15A.

V s mch o cc dng in trn.

Bi 4

Cho mt miliampemet o c dng cc i l 600 mA vi thang o 150 vch. Nu dng dng c ny o dng in I = 30 A th cn Rs l bao nhiu ? Nu kim ca Ampemet ( mc thm Sun) ch 50 vch th dng thc t l bao nhiu ? Bit in tr rA = 0,4 .

Bi 5.Mt c cu o t in chu c dng in I = 25mA. Ngi ta mc thm vo c cu ny Rs = 0.02 s o c dng cc i l 250 mA. Tnh cc in tr ph ni vi c cu mi ny o in p 100V; 250V v 600V. V s Vnmet.

Bi 6.Mt c cu t in c Icc = 30 A nu mun o c dng 30 A th phi mc thm Rs = 0,05. Dng c cu ny lm Vnmt. Tm cc in tr ph mc vi c cu Vnmt c th o c in p 5V, 10V, 20V ( trong 2 trng hp: mc ni tip v mc c lp).

Bi 7.Mt c cu o t in c Icc = 0,5mA nu mun o c in p 50V phi mc thm

Rf = 80k.

Nu dng c cu ny lm ampemet:

a) Tm gi tr dng in ln nht m cc thang o di y c th o c nu R1 = 0,005 , R2 = 0,05 , R3 = 0.5 .

b) Tm cc gi tr R1, R2, R3 nu bit gi tr cc i ca cc thang o nh sau:

Bi tp chng 3

Bi 1.

Cho mt cu o bit CM = 0,1 F v t s c th thay i trong khong: v . Hy v s cu v tnh Cx m cu c th o c.

Bi 2

Cho mt ng h o in tr dng phng php o so snh (cu n mt chiu) c di o: 0,001 9999 , cu o in tr cho t s : 10-n 10+n , R2 l in tr c th iu chnh c trong khong: 10 1000. Hy xc nh cc gi tr n cho.

Bi 3.

Cho cu o in dung, c CM = 0,1 F, RM = 125 , R3 = 10 k v

R4 = 14,7 k, tn s ca ngun cp 100Hz. Hy v s cu v tnh gi tr Cx v Rx v h s tn hao ca t trong 2 trng hp t cn xc nh tn hao nhiu v tn hao t.

Bi 4.

Cho cu o in dung, c CM = 0,1 F, RM = 375 , R3 = 10 k v

R4 = 14,7 k , tn s ca ngun cp 100Hz. Hy v s cu v tnh gi tr Cx v Rx v h s tn hao ca t trong trng hp t cn xc nh v t mu u tn hao nhiu.

Bi 5

Cho cu o in cm dng thnh phn t in mu tn hao nhiu c

CM = 0,1 F, RM = 470 , R1 = 1,26k, R4 = 500 . Hy v s cu v tnh gi tr Lx v Rx ca cun cm thc.

Bi 6

Cho cu o in cm, ngun cp c tn s l 100Hz. Cu cn bng khi

CM = 0,1 F, RM = 75 ( bit CM // RM). R1 = 1,26k, R4 = 500 . Hy v s cu v tnh in cm Lx v Rx.

Bi 7

Cho cu o in cm, bit LM= 100 H, RM = 37,1 , R3 = 27,93 k ,

R4 = 10k .Hy v s cu v tnh Lx , Rx ca cun cm thc.

Bi tp chng 4

Bi 1.

Trong mch ba pha, cng sut c xc nh theo s dng 2 otmt mt phn t, ti i xng. Cho Ud = 120 V, Id = 5A.P3pha = 807 W. Xc nh cng sut trn tng otmt, cng sut phn khng ca mch ba pha. V s mch o.

Bi 2.

Trong mch ba pha, cng sut c xc nh theo s dng 2 otmt mt phn t, ti i xng. Cho Ud = 120 V, Id = 5A.P1pha = 200 W. Xc nh cng sut trn tng otmt, cng sut phn khng ca mch ba pha. V s mch o.

Bi 3.

Trong mch ba pha, cng sut c xc nh theo s dng 2 otmt mt phn t, ti i xng. Cho Ud = 120 V, Id = 5A.Q3pha = 200 W. Xc nh cng sut trn tng otmt, cng sut tc dng ca mch ba pha. V s mch o.

Bi 4.

Trong mch ba pha, cng sut c xc nh theo s dng 2 otmt mt phn t (c Pm = 1000W, 150 vch) , ti i xng. Cho Ud = 120 V, Id = 5A. Bit otmt 1 ch 30 vch. Xc nh s ch ca ot mt 2 , cng sut tc dng v cng sut phn khng ca mch 3 pha ca mch ba pha. V s mch o.

Bi 5.

Trong mch ba pha, cng sut c xc nh theo s dng 2 otmt mt phn t (c Pm = 1000W, 150 vch) , ti i xng. Cho Ud = 120 V,. Bit otmt 1 ch 30 vch, otmt 2 ch 60 vch. Xc nh h s cng sut, dng in dy, cng sut tc dng v cng sut phn khng ca mch 3 pha ca mch ba pha. V s mch o.

Bi 6

kim tra cng t mt pha c cp chnh xc l 2,5; Im = 5A; Um = 127V, trn mt cng t c ghi: 1kWh-2500vng, ngi ta dng Otmt in ng c Im = 5A,Um = 150V; thang chia = 150 vch. Khi o kim Otmt ch 92 vch. Trong ba pht a cng t quay c 57 vng. Xc nh sai s ca cng t ?

Bi 7

Dng mt Ampemet c thang o 5A, Vnmet c thang o 120V v otmet c Im = 5A; Um = 120V, thang chia 120 vch o cng sut ca ti trong mch mt pha. Cc thit b ny c mc vo mch qua bin dng 100/5, bin p 6000/100. khi o ampemet ch 4A, Vnmet ch 100 V. Xc nh cng sut ca mch o v ch ca Otmt vi gi tr cos = 1; 0,5; 0,3. V s mch o.

R5

R2

R3

R4

50V

Rcc

R1

100V

200V

300V

500V

Icc

R2

R3

Rcc

R1

Icc

R2

R3

5A

Rcc

R1

2A

10mA

Icc

_1221048299.unknown

_1221048656.unknown

_1221046823.unknown