Cov lus nug piv txwv ntawm Kirchhoff's Law

3 Piv txwv ntawm Kirchhoff txoj cai

1. Saib daim duab kaw Circuit Court ntawm sab! Thaum R₁ = 2Ω, R₂ = 4Ω, R₃ = 6Ω, ces tam sim no ntws hauv lub voj voog yog ...

A. 1,2 Amperes
B. 1,0 Amperes
C. 0,6 Amperes
D. 0,5 Amperes
E. 0,2 Ampere

Kev Sib Tham
Nws yog paub :
Tus Resistor 1 (R)₁) = 2Ω
Tus Resistor 2 (R)₂) = 4Ω
Tus Resistor 3 (R)₃)= 6Ω
Qhov chaw ntawm emf 1 (E₁) = 9 V
Qhov chaw ntawm emf 2 (E₂) = 3 V
Nug Lub zog ntawm qhov tam sim no ntws hauv lub voj voog (I)
Jawb :

Qhov teeb meem no muaj feem cuam tshuam nrog Kirchhooff txoj cai. Cov kauj ruam thiab yuav ua li cas los daws qhov teeb meem no: Ua ntej, xaiv qhov kev taw qhia tam sim no uas koj nyiam. Koj tuaj yeem xaiv counterclockwise lossis clockwise. Qhov thib ob, thaum tam sim no hla dhau qhov tsis kam lossis resistor (R) muaj qhov txo qis hauv lub peev xwm yog li V = IR yog qhov tsis zoo. Qhov thib peb, yog tias tam sim no txav los ntawm qis mus rau qhov muaj peev xwm siab (- mus rau +) ces qhov chaw emf (E) yog cim zoo vim tias muaj lub zog them ntawm qhov chaw emf. Yog tias tam sim no txav los ntawm siab mus rau qhov muaj peev xwm qis (+ mus rau -) ces qhov chaw emf (E) yog cim tsis zoo vim tias muaj lub zog tso tawm ntawm qhov chaw emf.

Thaum daws qhov teeb meem no, qhov kev taw qhia ntawm qhov tam sim no raug xaiv kom nyob rau hauv tib qho kev taw qhia li qhov kev taw qhia clockwise.
– IR₁ Thiab₁ – IR₂ – IR₃ - E₂ = 0
– 2 Kuv + 9 – 4 Kuv – 6 Kuv – 3 = 0
– 12 Kuv + 6 = 0
– 12 Kuv = – 6
Kuv = -6 / -12
Kuv = 0,5

Cov hluav taws xob ntws los ntawm lub voj voog yog 0,5 Amperes. Cov hluav taws xob zoo qhia tias qhov kev taw qhia ntawm cov hluav taws xob yog raws li xav tau, clockwise. Cov hluav taws xob tsis zoo qhia tias qhov kev taw qhia ntawm cov hluav taws xob yog counterclockwise.
Cov lus teb yog D.

2. Saib cov duab hauv qab no! Tus nqi ntawm cov hluav taws xob ntws hauv lub voj voog yog ...

A. 0,6 A
B. 1,2 A
C. 1,6 A
D. 2,0 A
E. 2,5 A

Kev Sib Tham
Thaum daws qhov teeb meem no, qhov kev taw qhia ntawm qhov tam sim no raug xaiv kom nyob rau hauv tib qho kev taw qhia li qhov kev taw qhia clockwise.
-20 - 5I - 5I - 12 - 10I = 0
-32 – 20I = 0
-32 = 20I
Kuv = -32 / 20
Kuv = -1,6 Amperes
Vim tias qhov hluav taws xob tam sim no tsis zoo, qhov kev taw qhia tiag tiag ntawm qhov hluav taws xob yog tig mus rau sab laug. Qhov kev taw qhia no tsis sib xws nrog qhov kev xav thawj zaug ntawm kev tig mus rau sab xis.
Cov lus teb yog C.

3. Saib daim duab qhia txog hluav taws xob hauv qab no! Qhov loj ntawm cov hluav taws xob uas ntws hauv lub voj voog yog...
A. 5/3 A
B. 8/3 A
C. 11/3 A
D. 13/3 A
E. 14/3 A
Kev Sib Tham
Thaum daws qhov teeb meem no, qhov kev taw qhia ntawm qhov tam sim no raug xaiv kom nyob rau hauv tib qho kev taw qhia li qhov kev taw qhia clockwise.
IB - 6I + 12 - 2I + 12 = 0
-9I + 24 = 0
-9Kuv = -24
Kuv = 24 / 9
Kuv = 8 / 3 Amperes
Vim tias qhov hluav taws xob tam sim no yog qhov zoo, qhov kev taw qhia ntawm qhov hluav taws xob tam sim no yog tib yam li qhov kwv yees, uas yog nyob rau hauv qhov kev taw qhia ntawm kev tig clockwise.
Cov lus teb yog C.

Qhov chaw nug lus:

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