Cov lus nug piv txwv ntawm Transformer Transformer

23 Piv txwv ntawm cov lus nug txog transformer Transformers

1. Ib lub transformer muaj cov kauj thawj thiab kauj thib ob nrog 500 thiab 5000 tig, txuas nrog 220 V alternating current network. Dab tsi yog qhov hluav taws xob qhov tso zis?

A. 220 volts

B. 1.100 volts

C. 2.200 volts

D. 22.000 volts

Kev Sib Tham

Nws paub tias:

Lub kauj thawj zaug (N_P= 500 TZS kauj

Lub kauj thib ob (N_s= 5000 TZS kauj

Lub zog hluav taws xob tseem ceeb (V_P) = 220 Volt

Nug: Qhov hluav taws xob theem ob (V_S)

Lus teb:

Cov qauv hloov pauv:

V_s / N_s =V_p / N_p

V_s / 5000 = 220 / 500

V_s / 5000 = 0,44

V_s = (0,44)(5000)

V_s = 2.200 Volts

Cov lus teb yog C.

2. Lub luag haujlwm ntawm lub transformer yog ...

A. hloov qhov hluav taws xob thiab lub zog

B. hloov qhov hluav taws xob tam sim no

C. DC voltage regulator

D. ua kom cov hluav taws xob ncaj qha mus ua cov hluav taws xob hloov pauv

Kev Sib Tham

Cov transformers ua haujlwm los hloov qhov voltage ntawm alternating current (AC). Muaj ob hom transformers: step-up transformers thiab step-down transformers. Step-up transformers ua rau voltage nce, thaum step-down transformers txo qhov voltage.

Cov lus teb yog B.

3. Hauv lub transformer muaj ib lub kauj thawj uas muaj 1200 tig thiab ib lub kauj thib ob uas muaj 1000 tig. Yog tias tam sim no thawj yog 4 A, ces lub zog tam sim no thib ob yog ...

A. 2 Amperes

B. 3 Amperes

C. 4 Amperes

D. 4,8 Amperes

Kev Sib Tham

Nws paub tias:

Lub kauj thawj zaug (N_P) = 1200 tig

Lub kauj thib ob (N_S) = 1000 tig

Lub zog tam sim no thawj zaug (I_P) = 4 Amperes

Nug: Lub zog tam sim no theem ob (I_S)

Lus teb:

Cov qauv transformer uas hais txog kev sib raug zoo ntawm tus naj npawb ntawm cov kauj tig (N) thiab tam sim no (I) yog:

I_S/I_P = N_P/N_S

Lub zog theem ob yog:

I_S/4 = 1200/ 1000

I_S/4 = 1,2

I_S = 1,2 (4)

I_S = 4,8 Amperes

Cov lus teb yog D.

4. Thaum tsim lub transformer, los tsim kom muaj qhov hluav taws xob theem ob ntawm 220 volts los ntawm qhov hluav taws xob theem pib ntawm 110 volts, qhov piv ntawm tus lej ntawm qhov tig theem ob rau qhov tig thawj yog ...

A. 2: 3

B. 3: 2

C. 6: l2

D. 12: 6

Kev Sib Tham

Nws paub tias:

Qhov hluav taws xob theem ob (V_S) = 220 Volt

Lub zog hluav taws xob tseem ceeb (V_P) = 110 Volt

Nug Qhov piv ntawm tus naj npawb ntawm cov tig thib ob rau tus naj npawb ntawm cov tig thawj zaug (N_S/N_P)

Lus teb:

Cov qauv transformer uas hais txog kev sib raug zoo ntawm hluav taws xob voltage thiab tus naj npawb ntawm cov kauj tig yog:

V_S/V_P = N_S/N_P

220/110 = N_S/N_P

22/11 = N_S/N_P

2/1 = N_S/N_P

12/6 = N_S/N_P

Cov lus teb yog D.

5. Saib daim duab transformer hauv qab no!

Lub zog tseem ceeb ntawm lub transformer yog ...

A. 24 Volt

B. 240 Volt

C. 264 Volt

D. 340 Volt

Kev Sib Tham

Nws paub tias:

Qhov hluav taws xob theem ob (V_S) = 24 Volt

Lub kauj hluav taws xob thawj zaug (N_P los yog N₁) = 11 N

Qhov txuas thib ob (N_S los yog N₂) = 1 N = N

Nug: Lub zog hluav taws xob tseem ceeb (V_P)

Lus teb:

Cov qauv hloov pauv:

V_s / N_s =V_p / N_p

Lub zog hluav taws xob tseem ceeb yog xam los ntawm kev siv cov mis saum toj no:

V_s / N_s =V_p / N_p

24 / N = V_p / 11 N

24 / 1 = V_p / 11

24 = V_p / 11

V_p = (24)(11)

V_p = 264 Volts

Cov lus teb yog C.

6. Saib daim duab hauv qab no! Qhov loj ntawm lub transformer input voltage yog ...

A. 140 Volt

B. 180 Volt

C. 630 Volt

D. 720 Volt

Kev Sib Tham

Nws paub tias:

Lub kauj hluav taws xob thawj zaug (N₁) = 21 N

Qhov txuas thib ob (N₂) = 3 N

Qhov hluav taws xob theem ob (V₂) = 20 Volts

Nug: Lub zog hluav taws xob tseem ceeb (V₁)

Lus teb:

Cov qauv hloov pauv:

V₂ / N₂ =V₁ / N₁

Lub zog hluav taws xob tseem ceeb yog xam los ntawm kev siv cov mis saum toj no:

20 / 3N = V₁ / 21N

20 / 1 = V₁ / 7

20 = V₁ / 7

V₁ = (7)(20)

V₁ = 140 Volts

Cov lus teb yog lawm yog A.

7. Cov yam ntxwv ntawm lub transformer kauj ruam-up hauv qab no yog cov hauv qab no...

A. Lub zog hluav taws xob thawj zaug loj dua lub zog hluav taws xob thib ob

B. Tus naj npawb ntawm cov kauj thawj zaug tsawg dua li tus naj npawb ntawm cov kauj theem ob.

C. Qhov tam sim no hauv lub kauj thawj yog me dua li qhov tam sim no hauv lub kauj thib ob.

D. Lub zog ntawm lub kauj theem ob yog ntau dua li lub zog ntawm lub kauj thawj.

Kev Sib Tham

Lub transformer yog ib lub cuab yeej uas hloov lub zog hluav taws xob hloov pauv mus ua lub zog hluav taws xob hloov pauv. Cov transformers muaj ob hom: transformer nce qib dan kauj ruam-down transformer.

Ib lub transformer kauj ruam nce ua haujlwm los ua kom lub zog hluav taws xob nce ntxiv kom lub zog hluav taws xob theem ob loj dua lub zog hluav taws xob thawj, ntawm qhov tod tes, ib lub transformer kauj ruam nqis ua haujlwm los txo lub zog hluav taws xob kom lub zog hluav taws xob theem ob me dua lub zog hluav taws xob thawj.

Hauv ib lub transformer kauj ruam, tus naj npawb ntawm cov tig ntawm lub kauj theem nrab yog ntau dua li tus naj npawb ntawm cov tig ntawm lub kauj thawj, conversely hauv ib lub transformer kauj ruam qis, tus naj npawb ntawm cov tig ntawm lub kauj theem nrab yog tsawg dua li tus naj npawb ntawm cov tig ntawm lub kauj thawj.

Cov lus teb yog B.

8. Cov yam ntxwv ntawm lub tshuab hloov pauv kauj ruam yog ...

A. lub zog hluav taws xob tseem ceeb dua lub zog hluav taws xob thib ob

B. muaj ntau lub windings thawj zaug dua li cov windings thib ob

C. lub zog hluav taws xob tseem ceeb me dua lub zog hluav taws xob theem ob

D. Lub winding thawj zaug yog tib yam li lub winding thib ob

Kev Sib Tham

Lub transformer yog ib lub cuab yeej siv los hloov hluav taws xob alternating current (AC). Muaj ob hom transformers: step-up transformers thiab step-down transformers. Step-up transformers ua rau hluav taws xob nce, thaum step-down transformers txo hluav taws xob.

Cov yam ntxwv ntawm lub transformer step-up yog:

- Lub zog hluav taws xob tseem ceeb me dua, lub zog hluav taws xob thib ob loj dua

- tsawg dua qhov tig thawj zaug, ntau qhov tig thib ob

Cov yam ntxwv ntawm cov kauj ruam down transformer yog:

- Lub zog hluav taws xob tseem ceeb dua, lub zog hluav taws xob thib ob me dua

- ntau qhov tig thawj zaug, tsawg dua qhov tig thib ob

Cov lus teb yog C.

9. Saib daim duab qhia txog lub tshuab hluav taws xob hauv qab no!

Tus naj npawb ntawm cov tig thib ob ntawm lub transformer yog ....

A. 550 tig

B. 1.000 tig

C. 2.000 tig

D. 10.000 tig

Kev Sib Tham

Nws paub tias:

Lub zog hluav taws xob tseem ceeb (V_P) = 220 Volt

Lub kauj hluav taws xob thawj zaug (N_P) = 200 tig

Qhov hluav taws xob theem ob (V_S) = 1100 Volt

Nug: Qhov txuas thib ob (N_S)

Lus teb:

Cov qauv hloov pauv:

V_s / N_s =V_p / N_p

Tus naj npawb ntawm cov kev tig thib ob yog suav los ntawm kev siv cov qauv saum toj no:

V_s / N_s =V_p / N_p

1100 Volts / N_s = 220 Volts / 200 tig

1100 / N_s = 220/200

1100 / N_s = 1,1

N_s = 1100/1,1

N_s = 1000 tig

Cov lus teb yog B.

10. Saib daim duab qhia txog lub tshuab hluav taws xob hauv qab no!

Tus naj npawb ntawm cov tig thib ob ntawm lub transformer yog…..

A. 550 tig

B. 1.000 tig

C. 2.000 tig

D. 10.000 tig

Kev Sib Tham

Nws paub tias:

Lub zog hluav taws xob tseem ceeb (V_P) = 220 Volt

Lub kauj hluav taws xob thawj zaug (N_P) = 200 tig

Qhov hluav taws xob theem ob (V_S) = 1100 Volt

Nug: Qhov txuas thib ob (N_S)

Lus teb:

Cov qauv transformer uas hais txog kev sib raug zoo ntawm voltage thiab tus naj npawb ntawm kev tig yog:

V_s / N_s =V_p / N_p

Lub winding theem nrab yog xam siv cov mis saum toj no:

V_s / N_s =V_p / N_p

1100 / N_S = 220/200

1100 / N_S = 22/20

1100 / N_S = 1,1

N_S = 1100/1,1

N_S = 1000

Tus naj npawb ntawm cov tig thib ob yog 1000 tig.

Cov lus teb yog B.

11. Ua tib zoo saib cov ntaub ntawv transformer hauv qab no!

Raws li cov ntaub ntawv saum toj no, nws tuaj yeem xaus lus tias ...

Kev Sib Tham

Lub transformer yog ib lub cuab yeej uas ua haujlwm los nce lossis txo qhov voltage ntawm AC (alternating current). Lub transformer uas ua haujlwm los nce qhov voltage hu ua transformer. nce qib thiab lub transformer uas ua haujlwm los txo qhov voltage hu ua transformer nqis nqis.
Lub transformer muaj ob lub kauj hlau, uas yog lub kauj thawj (N) thiab lub kauj thib ob (N)._P) thiab kauj theem nrab (N_S). Ntawm lub transformer nce qibN_S loj dua N_PNyob rau ntawm lub transformer nqis nqisN_S me dua N_PLub tshuab hluav taws xob nce qib ua rau lub zog hluav taws xob nce ntxiv, yog li ntawd lub zog hluav taws xob hauv lub kauj thawj zaug me dua thiab lub zog hluav taws xob hauv lub kauj thib ob loj dua. Ntawm qhov tod tes, lub transformer nqis nqis txo qhov voltage kom qhov hluav taws xob ntawm lub kauj thawj zaug loj dua thiab qhov hluav taws xob ntawm lub kauj thib ob me dua.
Transformer A yog ib qho transformer nqis nqis thiab transformer B yog transformer nce qib.
Cov lus teb yog C.

12. Saib daim duab transformer hauv qab no!

Los ntawm cov ntaub ntawv hauv daim duab saum toj no, cov lus hais raug txog daim duab 1 thiab daim duab 2 feem yog ...

A. Daim duab 1 yog lub transformer nce thiab Daim duab 2 yog lub transformer nqis
B. Daim Duab 1 yog lub transformer nqis qis thiab Daim Duab 2 yog lub transformer nce siab
C. Cov duab 1 thiab 2 yog cov kauj ruam down transformers
D. Cov duab 1 thiab 2 yog cov transformers step-up.

Kev Sib Tham
Nyob rau ntawm lub transformer nce qib (voltage booster), lub zog hluav taws xob tseem ceeb me dua thiab lub zog hluav taws xob theem nrab loj dua. Hauv lub transformer nqis nqis (qhov txo qhov hluav taws xob), qhov hluav taws xob thawj zaug loj dua thiab qhov hluav taws xob thib ob me dua.
Lub transformer hauv Daim Duab 1 muaj lub zog hluav taws xob tseem ceeb loj dua lub zog hluav taws xob thib ob (20 V > 5 V) thiab yog li ntawd nws yog lub transformer. nqis nqisLub transformer hauv daim duab 2 muaj lub zog hluav taws xob tseem ceeb uas me dua lub zog hluav taws xob thib ob (5 V < 40 V) thiab yog li ntawd yog lub transformer. nce qib.
Cov lus teb yog B.

13. Saib daim duab qhia txog lub tshuab hloov pauv hauv qab no!

Los ntawm daim duab qhia saum toj no, cov lus hais raug yog ...
A. Transformer I = kauj ruam down transformer, vim N_s > N_p
B. Transformer I = kauj ruam nce transformer, vim V_s <V_p
C. Transformer II = kauj ruam down transformer, vim V_p <V_s
D. Transformer II = kauj ruam nce transformer, vim N_p < N_s
Kev Sib Tham
Transformer Kuv yog lub transformer nqis nqis vim V._p > V_s thiab Np > Ns.
Transformer II yog lub transformer nce qib vim V._p <V_s thiab N_p < N_s.
Cov lus teb yog D.

14. Ua tib zoo saib daim duab qhia txog transformer hauv qab no!
Yog tias tus naj npawb ntawm cov kauj tig yog N₁ = 100 tig thiab N₂ = 250 tig, voltage V₂ yog ....

A. 100 Volt
B. 150 Volt
C. 200 Volt
D. 250 Volt

Kev Sib Tham

Nws paub tias:
Lub zog hluav taws xob tseem ceeb = V_p =V₁ = 40 Volts
Lub kauj thawj zaug = N_p = N₁ = 100 tig
Kauj theem ob = N_s = N₂ = 250 tig
Lus Nug: Qhov hluav taws xob theem ob = V_s =V₂
Lus teb:

Cov qauv hloov pauv:
V_s / N_s =V_p / N_p
Qhov hluav taws xob theem ob:
V_s / N_s =V_p / N_p
V_s / 250 = 40 / 100
V_s / 250 = 4 / 10
V_s / 250 = 0,4
V_s = (0,4)(250)
V_s = 100 Volts
Cov lus teb yog lawm yog A.

15.

Cov hauv qab no yog daim duab qhia txog lub tshuab hloov pauv zoo tagnrho nrog nws cov ntaub ntawv. Yog tias qhov tam sim no ntws los ntawm resistor R yog 4 Amperes, qhov tam sim no ntws los ntawm lub kauj thawj yog….

A. 0,8 A
B. 1,6 A
C. 5,0 A
D. 20 A

Kev Sib Tham
Nws paub tias:
Lub kauj thawj zaug = N_p = N₁ = 600 tig
Tam sim no theem ob = Kuv_s = Kuv₂ = 4 Amperes
Kauj theem ob = N_s = N₂ = 120 tig
Lo lus nug: Thawj qhov tam sim no = Kuv_p = Kuv₁
Lus teb:
Cov qauv hloov pauv:
I_P N_p = Kuv_s N_s
Lub zog tam sim no tseem ceeb:
I_P N_p = Kuv_s N_s
I_P (600) = (4)(120)
I_P (600) = 480
I_P (60) = 48
I_P = 48/60
I_p = 0,8 Amperes
Cov lus teb yog lawm yog A.

16.
Saib daim duab hauv qab no!
Hauv daim duab transformer hauv qab no, qhov tam sim no tseem ceeb yog ....
A. 0,1 A
B. 0,2 A
C. 0,8 A
D. 1,6 A
Kev Sib Tham
Nws paub tias:
Lub zog hluav taws xob tseem ceeb = V_p =V₁ = 100 Volts
Qhov hluav taws xob theem ob = V_s =V₂ = 50 Volts
Tam sim no theem ob = Kuv_s = Kuv₂ = 0,4 Amperes
Lo lus nug: Thawj qhov tam sim no = Kuv_p = Kuv₁
Lus teb:
Cov qauv hloov pauv:
V_P I_p =V_s I_s
Lub zog tam sim no tseem ceeb:
V_P I_p =V_s I_s
(100) I_p = (50)(0,4)
(100) I_p = 20
I_p = 20/100
I_p = 0,2 Amperes
Cov lus teb yog B.

17. Saib ntawm lub rooj ntsuas voltage thiab tam sim no kom pom lub transformer zoo tagnrho hauv qab no!
Raws li lub rooj saum toj no, cov nqi R thiab P yog ...

A. R = 600 Volts; P = 30 tig
B. R = 200 Volts; P = 30 tig
C. R = 60 Volts; P = 40 tig
D. R = 20 Volts; P = 40 tig
E. R = 10 Volts; P = 20 tig

Kev Sib Tham

Cov mis hloov pauv
V_s N_p = N_s V_p  thiab V_p I_p =V_s I_s
Cov Ntaub Ntawv:
V_s = qhov hluav taws xob theem ob, V_p = lub zog hluav taws xob thawj zaug, N_s = qhov txuas ntxiv, N_p = thawj lub kauj vuam_, I_p = lub zog tam sim no thawj zaug, Kuv_s = lub zog tam sim no theem ob
Lub zog hluav taws xob tseem ceeb (V_p)
V_p I_p =V_s I_s
V_p (4) = (10)(80)
V_p = 800/4
V_p = R = 200 Volt
Qhov txuas thib ob (N_s)
V_s N_p = N_s V_p
(10)(600) = N_s (200)
6000 = 200 N_s
N_s = 6000/200
N_s = P = 30 tig
Cov lus teb yog B.

18. Cov lus hauv qab no qhia cov ntaub ntawv rau ob lub transformers zoo tagnrho.
Raws li cov ntaub ntawv hauv lub rooj saum toj no, cov nqi ntawm K thiab L yog feem ...

A. K = 1 A thiab L = 20 Volts
B. K = 2 A thiab L = 30 Volts
C. K = 3 A thiab L = 40 Volts
D. K = 4,5 A thiab L = 53 Volts
E. K = 5 A thiab L = 30 Volts

Kev Sib Tham
Siv ib qho ntawm cov qauv transformer los txiav txim siab qhov tam sim no theem ob ntawm transformer 1 thiab qhov hluav taws xob theem ob ntawm transformer 2. Yog tias xam qhov tam sim no theem ob ntawm transformer 1, siv cov ntaub ntawv rau transformer 1, ib yam li ntawd yog tias xam qhov hluav taws xob theem ob ntawm transformer 2, siv cov ntaub ntawv rau transformer 2.
Lub zog tam sim no theem ob (I_s) lub tshuab hloov pauv 1
V_p I_p =V_s I_s
(200)(3) = (300)(Kuv_s)
I_s = 600/300
I_s = K = 2 Amperes
Qhov hluav taws xob theem ob (V_s) lub tshuab hloov pauv 2
V_p I_p =V_s I_s
(40)(0,75) = V_s (1)
V_s = L = 30 Volt
Cov lus teb yog B.

19. Ua tib zoo saib cov ntaub ntawv ntsuas rau ntau qhov ntau hauv lub transformer hauv qab no!
Raws li cov ntaub ntawv hauv lub rooj saum toj no, cov nqi ntawm P thiab Q yog feem ...
A. P = 100 Volts thiab Q = 4 Amperes
B. P = 100 Volts thiab Q = 6 Amperes
C. P = 110 Volts thiab Q = 4 Amperes
D. P = 110 Volts thiab Q = 2 Amperes
E. P = 220 Volts thiab Q = 2 Amperes
Kev Sib Tham
Lub zog hluav taws xob tseem ceeb (V_p)
V_s N_p = N_s V_p
(220)(300) = (600) V_p
(220)(3) = (6) V_p
660 : 6 v_p
V_p = 660/6
V_p = P = 110 Volt
Lub zog tam sim no thawj zaug (I_p)
V_p I_p =V_s I_s
(110)(Kuv_p) = (220)(2)
(110)(Kuv_p= 440 TZS
I_p = 440/110
I_p = Q = 4 Amperes
Cov lus teb yog C.

20. Kev sib tham txog SMA/MA physics cov lus nug ntawm UN - Transformers

1. Ib lub transformer zoo tagnrho muaj nws lub kauj thawj txuas nrog lub zog hluav taws xob thiab nws lub kauj thib ob txuas nrog lub teeb raws li pom hauv daim duab hauv qab no. Cov lus twg yog qhov tseeb?

A. Lub teeb yuav dimmer yog tias lub winding thawj zaug raug txo.

B. Lub teeb yuav ci dua yog tias ntxiv qhov cua ntsawj thib ob.

C. Lub teeb yuav tsaus dua yog tias qhov hluav taws xob tseem ceeb nce ntxiv.

D. Lub teeb yuav ci dua yog tias lub winding thawj zaug raug txo.

E. Qhov ci ntsa iab lossis qhov tsaus ntuj ntawm lub teeb yuav zoo ib yam txawm tias lub kauj hloov pauv lawm los xij.

Kev Sib Tham

Kev hloov tus naj npawb ntawm cov kauj tig tsuas yog nyob ntawm hom transformer. Yog tias tus naj npawb ntawm cov tig hauv lub kauj thawj zaug raug txo qis, ua rau muaj ntau qhov tig hauv lub kauj thib ob, lub transformer dhau los ua lub transformer nce qib, uas ua rau lub zog hluav taws xob nce ntxiv. Ib yam li ntawd, yog tias tus lej ntawm cov tig hauv lub kauj thawj zaug nce ntxiv kom tus lej ntawm cov tig hauv lub kauj thib ob tsawg dua, lub transformer no dhau los ua lub transformer kauj ruam uas ua haujlwm los txo qhov hluav taws xob.

Nws yog ib qho tseem ceeb uas yuav tsum nco ntsoov tias thaum lub zog hluav taws xob nce ntxiv, tam sim no yuav txo qis, yog li lub zog tseem nyob ruaj khov (P = VI). Lub zog hluav taws xob yog qhov kev hloov pauv ntawm lub zog hluav taws xob dhau lub sijhawm tshwj xeeb. Thaum lub zog nkag sib npaug rau lub zog tso zis, qhov ntau ntawm lub zog siv kuj zoo ib yam.

Qhov ci ntsa iab lossis qhov tsaus ntuj ntawm lub teeb nyob ntawm seb lub zog hluav taws xob hloov mus ua lub teeb ntau npaum li cas. Yog tias muaj lub zog hluav taws xob ntau heev hloov mus ua lub teeb, lub teeb yuav ci ntsa iab; ntawm qhov tod tes, yog tias tsuas yog me me xwb hloov mus ua lub teeb, lub teeb yuav tsaus ntuj. Vim tias lub zog hluav taws xob raug txuag, qhov ci ntsa iab lossis qhov tsaus ntuj ntawm lub teeb yuav tseem zoo li qub. 

Cov lus teb yog yog E.

21. Daim duab hauv qab no qhia txog lub transformer zoo tagnrho. Lub kauj thawj zaug txuas nrog lub zog hluav taws xob thiab lub kauj thib ob txuas nrog lub teeb (L). Lub teeb yuav ces...

A. Qhov ci ntsa iab ib txwm thaum lub winding thawj zaug hloov pauv

B. Dims thaum lub zog hluav taws xob tseem ceeb nce ntxiv

C. Nws ci dua yog tias qhov txuas ntxiv thib ob ntxiv.

D. Dimmer yog tias qhov winding thib ob ntxiv rau

E. Nws ci dua yog tias qhov winding thawj zaug raug txo qis.

Kev Sib Tham

Lub zog nkag = P = VI = (200 Volts) (2 Ampere) = 400 Watts = Lub zog tso zis

Cov transformers tsuas yog txo qhov voltage tab sis tsis txo lub zog. Lub zog nkag sib npaug rau lub zog tso zis, yog li lub zog hluav taws xob siv rau lub sijhawm muab kuj zoo ib yam. Yog li ntawd, qhov ci ntsa iab ntawm lub teeb tseem zoo li qub, lossis tsis hloov pauv.

Cov lus teb yog lawm yog A. 

Qhov ntawd yog txhua qhov kev sib tham ntawm cov lus nug piv txwv txog transformers.

22. Ib tug tub ntxhais kawm xav tau 18 W ntawm lub zog AC. Nws txuas lub transformer uas muaj kev ua haujlwm ntawm 75% thiab ntau zaus ntawm 100 thiab 200 rau lub roj teeb 12 V. Nws hloov tawm tias nws tsis tau txais lub zog xav tau. Nws pom tias lub zog AC yog ...

A. 36 W vim nws txuas 100 tig rau lub roj teeb.

B. 24 W vim nws txuas 200 tig rau lub roj teeb

C. 12 W vim nws txuas 200 tig rau lub roj teeb

D. 0 W vim nws txuas 200 lub kauj rau lub roj teeb.

E. 18 W vim nws txuas 200 tig rau lub roj teeb

Kev Sib Tham

Lub transformer yog ib lub cuab yeej siv los ua kom AC voltage nce lossis txo. Cov roj teeb yog qhov chaw ntawm DC voltage.

Cov lus teb yog D.

23. Ua tib zoo saib cov lus qhia ntawm lub transformer hauv qab no!

Cov lus hais tseeb txog transformers P thiab Q yog ...

A. P yog ib qho kauj ruam down transformer vim tias Is < Ip

B. P yog ib qho hloov pauv nce qib vim Vp < Vs

C. Q yog ib qho step up transformer vim Vp > Vs

D. Q yog ib qho hloov pauv nce qib vim tias Is > Ip

Kev Sib Tham

P yog ib lub transformer nce mus vim tias lub zog hluav taws xob thawj zaug (Vp = 110 V) < lub zog hluav taws xob thib ob (Vs = 200 V).

Q yog ib qho transformer down down vim tias qhov hluav taws xob thawj zaug (Vp = 220 V) > qhov hluav taws xob thib ob (Vs = 110 V).

Cov lus teb yog B.

Qhov chaw nug lus:

Cov Lus Nug Txog Kev Xeem Thoob Tebchaws ntawm Tsev Kawm Ntawv Theem Nrab Qib Siab/Islamic Tsev Kawm Ntawv Theem Nrab Qib Siab Science

Cov Lus Nug Txog Kev Xeem Physics Hauv Tebchaws Rau Tsev Kawm Ntawv Theem Siab/Tsev Kawm Ntawv Theem Siab Ua Haujlwm

Cov Lus Nug Txog Physics ntawm SBMPTN