Mafunso a chitsanzo cha Kirchhoff's Law

Zitsanzo 3 za Malamulo a Kirchhoff

1. Yang'anani chithunzi cha closed circuit chomwe chili pambali! Pamene R₁ = 2Ω, R₂ = 4Ω, R₃ = 6Ω, ndiye kuti mphamvu yamagetsi yomwe ikuyenda mu dera ndi...

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

Zokambirana
Ndizodziwika kuti :
Wotsutsa 1 (R)₁) = 2Ω
Wotsutsa 2 (R)₂) = 4Ω
Wotsutsa 3 (R)₃)= 6Ω
Gwero la emf 1 (E)₁) = 9 V
Gwero la emf 2 (E)₂) = 3 V
Anafunsa Mphamvu ya mphamvu yamagetsi yomwe ikuyenda mu dera (I)
Yankhani :

Vutoli likugwirizana ndi lamulo la Kirchhooff. Njira ndi momwe mungathetsere vutoli: Choyamba, sankhani njira yomwe mukufuna panopa. Mutha kusankha motsatira njira yotsutsana ndi wotchi kapena motsatira wotchi. Chachiwiri, pamene mphamvu yamagetsi imadutsa mu resistor kapena resistor (R) pali kuchepa kwa mphamvu kotero kuti V = IR ndi negative. ChachitatuNgati mphamvu yamagetsi yasuntha kuchoka pa mphamvu yotsika kupita ku mphamvu yayikulu (- mpaka +) ndiye kuti gwero la emf (E) lalembedwa kuti ndi labwino chifukwa pali mphamvu yochaja pa gwero la emf. Ngati mphamvu yamagetsi yasuntha kuchoka pa mphamvu yayikulu kupita ku mphamvu yotsika (+ mpaka -) ndiye kuti gwero la emf (E) lalembedwa kuti ndi loipa chifukwa pali mphamvu yotulutsa pa gwero la emf.

Pothetsa vutoli, njira ya magetsi imasankhidwa kuti ikhale yofanana ndi njira yozungulira wotchi.
- IR₁ +E₁ - IR₂ - IR₃ - E₂ = 0
– 2 Ine + 9 – 4 Ine – 6 Ine – 3 = 0
– 12 I + 6 = 0
– 12 I = – 6
Ine = -6 / -12
Ine = 0,5

Mphamvu yamagetsi yomwe ikuyenda mu dera ndi 0,5 Amperes. Mphamvu yabwino imasonyeza kuti mphamvu yamagetsi ili motsatira momwe ikuyembekezeredwa, motsatira wotchi. Mphamvu yoipa imasonyeza kuti mphamvu yamagetsi ili motsatira wotchi.
Yankho lolondola ndi D.

2. Yang'anani zithunzi zotsatirazi! Kuchuluka kwa mphamvu yamagetsi yomwe ikuyenda mu dera ndi...

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

Zokambirana
Pothetsa vutoli, njira ya magetsi imasankhidwa kuti ikhale yofanana ndi njira yozungulira wotchi.
-20 – 5I -5I – 12 – 10I = 0
-32 – 20I = 0
-32 = 20I
Ine = -32 / 20
I = -1,6 Ampere
Popeza mphamvu yamagetsi ndi yoipa, njira yeniyeni ya mphamvu yamagetsi ndi yotsutsana ndi wotchi. Njira imeneyi sikugwirizana ndi lingaliro loyamba la kuzungulira mozungulira wotchi.
Yankho lolondola ndi C.

3. Yang'anani chithunzi chotsatira cha magetsi! Kukula kwa mphamvu yamagetsi yomwe ikuyenda mu magetsi ndi…
A. 5/3 A
B. 8/3 A
C. 11/3 A
D. 13/3 A
E. 14/3 A
Zokambirana
Pothetsa vutoli, njira ya magetsi imasankhidwa kuti ikhale yofanana ndi njira yozungulira wotchi.
- Ine - 6I + 12 - 2I + 12 = 0
-9I + 24 = 0
-9I = -24
Ine = 24/9
I = 8 / 3 Ampere
Popeza mphamvu yamagetsi ndi yabwino, njira yamagetsi ndi yofanana ndi kuyerekezera, komwe kuli kozungulira mozungulira wotchi.
Yankho lolondola ndi C.

Gwero la funso:

Mafunso a National Examination Physics a Senior High School/Vocational High School