Chitsanzo cha mafunso okhudza magetsi

Zitsanzo 15 za Mavuto a Dera la Magetsi

1. Yang'anani chithunzicho!

Ngati R₁, = 6 Ω, R₂ =R₃ = 2 Ω, ndipo kusiyana kwa mphamvu ya ma volts 14, ndiye kuti kukula kwa mphamvu yamagetsi ndi…

A. 7 A

B. 6 A

C. 2 A

D. 1 A

Zokambirana

Amadziwika kuti:

Wotsutsa 1 (R)₁) = 6 Ω

Wotsutsa 2 (R)₂) = 2 Ω

Wotsutsa 3 (R)₃) = 2 Ω

Kusiyana komwe kungatheke (V) = 14 Volts

Anafunsa : Mphamvu ya madzi oyenda

Yankho:

Werengani chotsutsa cholowa m'malo (R):

R₂ ndi R₃ cholumikizidwa motsatizana. Chotsukira cholowa m'malo ndi:

1 / R₂₃ = 1/R₂ + 1/R₃ = 1/2 + 1/2 = 2/2

R₂₃ = 2/2 = 1 Ω

R₁ ndi R₂₃ cholumikizidwa motsatizana. Choletsa cholowa m'malo ndi:

R= R₁ +R₂₃ = 6 Ω + 1 Ω

R = 7Ω

Werengerani mphamvu yamagetsi (I):

I = V / R = 14 / 7 = 2 Ampere

Yankho lolondola ndi C.

2. Ngati choletsa chilichonse chili ndi mtengo wofanana ndipo chayikidwa pa kusiyana komweko kwa mphamvu, ndiye kuti dera lomwe lili ndi mtengo waukulu kwambiri wamagetsi ndi...

Zokambirana

Tiyerekeze kuti mtengo wa resistor iliyonse ndi R ndipo kusiyana komwe kungatheke ndi V.

Yankho lolondola ndi B.

3. Yang'anani chithunzicho!

Pamene chosinthira S₂ ikalumikizidwa, ndiye kuti njira yolondola ya magetsi ikuwonetsedwa pamalopo...

A. A – B – E – F

B. B – C – D – F

C. A – C – D – F

D. F – E – B – A

Zokambirana

Mphamvu yamagetsi imasuntha kuchokera pamalo omwe ali ndi mphamvu yayikulu kupita pamalo omwe ali ndi mphamvu yochepa. Ngati switch s2 yatsekedwa (switch s2 ili pafupi ndi mfundo A), ndiye kuti mphamvu yamagetsi imasuntha kuchokera ku A kupita ku B kupita ku E kupita ku F. Mphamvu yamagetsi siyenda ku C ndi D chifukwa C ndi D zili mu dera lotseguka.

Yankho lolondola ndi A.

4. Yang'anani chithunzi chotsatirachi!

Ngati R₁ = 4 ohms, R₂ = 6 ohms, R₃ = 2 ohms, ndipo V = 24 volts, ndiye kuti kukula kwa mphamvu yamagetsi ndi mu mndandanda uwu muli...

A. 0,5 ampere

B. 1 ampere

C. 2 ampere

D. 12 amperes

Zokambirana

Amadziwika kuti:

Wotsutsa 1 (R)₁) = 4 Ohms

Wotsutsa 2 (R)₂) = 6 Ohms

Wotsutsa 3 (R)₃) = 2 Ohms

Mphamvu yamagetsi (V) = 24 Volts

Anafunsa kuti: Mphamvu ya mphamvu yamagetsi yomwe ikuyenda mu dera

Yankho:

R₁, R₂ ndi R₃ cholumikizidwa motsatizana. Choletsa cholowa m'malo ndi:

R= R₁ +R₂ +R₃ = 4 + 6 + 2

R = 12 Ohm

Mphamvu yamagetsi yomwe ikuyenda mu dera:

I = V / R = 24 / 12 = 2 Ampere

Yankho lolondola ndi C.

5. Yang'anani chithunzichi! Nyali yomwe magetsi ake ndi ofanana ndi magetsi omwe amadutsa mu gwero la emf ndi...

A. L₁

B. L₂

C.L₃

D.L₄

Zokambirana

Lamulo Loyamba la Kirchhoff limati mphamvu yamagetsi yodutsa mu nthambi idzagawikana. Mwachitsanzo, ngati mphamvu yamagetsi yochokera ku gwero la emf ndi 4 Amperes, ikalowa mu nthambi ziwiri, mphamvu yamagetsi iyi imagawidwa pawiri, ndipo waya uliwonse uli ndi mphamvu yamagetsi ya 2 Amperes. Mphamvu yamagetsi ya 2 Amperes imagawidwa pawiri ngati mphamvu yamagetsi yolowa mu nthambi yomwe ili ndi nthambi ziwiri. Komabe, malinga ndi chithunzi pamwambapa, mphamvu yamagetsi yogawikanayo pamapeto pake imalumikizananso.

Chifukwa chake kutengera chithunzi pamwambapa, nyali yomwe magetsi ake ndi ofanana ndi magetsi omwe amadutsa mu gwero la emf ndi nyali ziwiri (L).₂) yomwe ili pafupi ndi ngodya yakumanja pamwamba.

Yankho lolondola ndi B.

6. Kuchokera pa chithunzi chotsatira cha dera, ndi chiti chomwe chidzayendetsa magetsi amphamvu kwambiri?

Zokambirana

Mphamvu yamagetsi mu circuit A.

Chotsutsa chosinthira (R):

R₁ = 3 Ω, R₂ = 4 Ω, R₃ = 4 Ω, V = 12 Volt

R₂ ndi R₃ cholumikizidwa motsatizana. Chotsukira cholowa m'malo ndi:

1 / R₂₃ = 1/R₂ + 1/R₃ = 1/4 + 1/4 = 2/4 = 1/2

R₂₃ = 2/1 = 2 Ω

R₁ ndi R₂₃ cholumikizidwa motsatizana. Choletsa cholowa m'malo ndi:

R= R₁ +R₂₃ = 3 Ω + 2 Ω = 5 Ω

Mphamvu yamagetsi (I):

I = V / R = 12 / 5 = 2,4 Ampere

Mphamvu yamagetsi mu circuit B.

Chotsutsa chosinthira (R):

R₁ = 8 Ω, R₂ = 2 Ω, R₃ = 2 Ω, V = 36 Volt

R₁, R₂ ndi R₃ cholumikizidwa motsatizana. Choletsa cholowa m'malo ndi:

R= R₁ + R₂ + R₃ 8 + 2 + 2 = 12 Ω

Mphamvu yamagetsi (I):

I = V / R = 36 / 12 = 3 Ampere

Mphamvu yamagetsi mu circuit C.

Chotsutsa chosinthira (R):

R₁ = 4 Ω, R₂ = 4 Ω, R₃ = 6 Ω, V = 12 Volt

R₂ ndi R₃ cholumikizidwa motsatizana. Chotsukira cholowa m'malo ndi:

1 / R₂₃ = 1/R₂ + 1/R₃ = 1/4 + 1/4 + 1/6 = 3/12 + 3/12 + 2/12 = 8/12

R₂₃ = 12/8 = 1,5 Ω

Mphamvu yamagetsi (I):

I = V / R = 12 / 1,5 = 8 Ampere

Mphamvu yamagetsi mu dera D.

Chotsutsa chosinthira (R):

R₁ = 3 Ω, R₂ = 3 Ω, R₃ = 3 Ω, R₄ = 3 Ω, R₅ = 6 Ω, V = 24 Volt

R₂, R₃ ndi R₄ cholumikizidwa motsatizana. Chotsukira cholowa m'malo ndi:

1 / R₂₃₄ = 1/R₂ + 1/R₃ + 1/R₄ = 1/3 + 1/3 + 1/3 = 3/3

R₂₃₄ = 3/3 = 1 Ω

R₁, R₂₃₄ ndi R₅ cholumikizidwa motsatizana. Choletsa cholowa m'malo ndi:

R= R₁ +R₂₃₄ +R₅ 3 + 1 + 6 = 9 Ω

Mphamvu yamagetsi (I):

I = V / R = 24 / 9 = 2,6 Ampere

Yankho lolondola ndi C.

7. Samalani mndandanda wotsatira!

Dziwani:

A. Kukana konse

B. Kukula kwa mphamvu yamagetsi mu dera

C. Pakadali pano I₁

D. Panopa I₂

Zokambirana

Amadziwika kuti:

Wotsutsa 1 (R)₁= = 4 Ω

Wotsutsa 2 (R)₂) = 4 Ω

Wotsutsa 3 (R)₃) = 2 Ω

Wotsutsa 4 (R)₄) = 3 Ω

Mphamvu yamagetsi (V) = 12 Volts

Yankho:

A. Kukana konse (R)

Wotsutsa R₂ ndi chotsutsa R₃ cholumikizidwa motsatizana. Choletsa cholowa m'malo ndi:

R₂₃ =R₂ +R₃ = 4 Ω + 2 Ω = 6 Ω

Wotsutsa R₂₃ ndi zotsutsa R₄ cholumikizidwa motsatizana. Chotsukira cholowa m'malo ndi:

1 / R₂₃₄ = 1 /R₂₃ + 1/R₄ = 1/6 + 1/3 = 1/6 + 2/6 = 3/6

R₂₃₄ = 6/3 = 2 Ω

Wotsutsa R₁ ndi zotsutsa R₂₃₄ cholumikizidwa motsatizana. Choletsa cholowa m'malo ndi:

R = R₁ + R₂₃₄ = 4 Ω + 2 Ω = 6 Ω

Chifukwa chake, kukana konse ndi 6 ohms.

B. Kukula kwa mphamvu yamagetsi mu dera (I)

Fomula yomwe imafotokoza ubale pakati pa voltage, current ndi resistance ndi iyi:

V = IR

Kufotokozera kwa fomula: V = Voliyumu yamagetsi, I = mphamvu yamagetsi, R = kukana kwamagetsi

Gwiritsani ntchito fomula iyi kuti muwerengere mphamvu yamagetsi:

I = V / R = 12 Volts / 6 Ohms = 2 Amps

C. Pakadali pano I₁

Mphamvu yamagetsi yomwe imadutsa mu resistor R₁ = magetsi odutsa mu dera = 2 Ampere.

D. Panopa I₂

Musanawerengere mphamvu yamagetsi yomwe ikudutsa mu resistor R₂, choyamba mvetserani kufotokozera kotsatira.

Wotsutsa R₂₃ ndi zotsutsa R₄ yolumikizidwa motsatizana. Chotsukira chosinthira kutengera zotsatira zam'mbuyomu ndi R₂₃₄ = 2 Ahm.

Mphamvu yamagetsi yomwe imadutsa mu resistor R₂₃₄ = mphamvu yamagetsi yomwe imadutsa mu resistor R₁ = 2 Ampere.

Kusiyana komwe kulipo pakati pa malekezero awiri a resistor R₂₃₄ ndi:

V = IR₂₃₄ = (2 A)(2 Ohm) = 4 Volt

Kusiyana komwe kulipo pakati pa malekezero awiri a resistor R₂₃₄ = kusiyana komwe kulipo pakati pa malekezero awiri a resistor R₄ = kusiyana komwe kulipo pakati pa malekezero awiri a resistor R₂₃ = Ma Volti 4.

Chotsutsa chosinthira R₂₃ kutengera zotsatira za mawerengedwe am'mbuyomu ndi 6 ohm.

Kotero mphamvu yamagetsi yomwe imadutsa mu resistor yosinthira R₂₃ ndi:

I = V / R = 4 Volts / 6 Ohms = 2/3 Ampere

Mphamvu yamagetsi yomwe imadutsa mu resistor R₂₃ = mphamvu yamagetsi yomwe imadutsa mu resistor R₂ = mphamvu yamagetsi yomwe imadutsa mu resistor R₃ = 2/3 Ampere.

8. Yang'anani dera lamagetsi lomwe lili m'mbali! Ngati R₁ =R₂ = 10 Ω ndi R₃ =R₄ = 8 Ω. Kodi mphamvu yamagetsi (I) ikuyenda bwanji?

A. 0,5 A

B. 2 A

C. 36 A

D. 288 A

Zokambirana

Amadziwika kuti:

Wotsutsa R₁ = Wotsutsa R₂ = 10 Ω

Wotsutsa R₃ = Wotsutsa R₄ = 8 Ω

Mphamvu yamagetsi (V) = 12 Volts

Anafunsa kuti: Mphamvu ya magetsi (I) omwe akuyenda

Yankho:

Chotsutsa chosinthira (R).

Wotsutsa R₃ ndi chotsutsa R₄ cholumikizira pamodzi, chotsutsa cholowa m'malo ndi:

1 / R₃₄ = 1/R₃ + 1/R₄ = 1/8 + 1/8 = 2/8

R₃₄ = 8/2 = 4 Ω

Wotsutsa R₁, R₂ ndi R₃₄ cholumikizira motsatizana, chotsutsa cholowa m'malo ndi:

R = R₁ +R₂ +R₃₄ = 10 Ω + 10 Ω + 4 Ω = 24 Ω

Mphamvu yamagetsi:

I = V / R = 12 Volts / 24 Ohms = 0,5 Volts/Ohms = 0,5 Amps

Yankho lolondola ndi A.

9. Yang'anani chithunzi cha magetsi otsekedwa m'mbali! Ngati kukana kwa batri sikunyalanyazidwa, ndiye kuti mphamvu yamagetsi (I) yomwe ikuyenda mu magetsi ndi…..

A. 0,5 Ampere

B. 1 Ampere

C. 2 Ampere

D. 3 Ampere

Zokambirana

Amadziwika kuti:

Wotsutsa R₁ = 3 Ohms

Wotsutsa R₂ = 3 Ohms

Wotsutsa R₃ = 6 Ohms

Mphamvu yamagetsi (V) = 6 Volts

Anafunsa kuti: Mphamvu yamagetsi (I)

Yankho:

Werengani choletsa cholowa m'malo:

Wotsutsa R₁ ndi R₂ Yokonzedwa motsatizana. Chotsukira cholowa m'malo ndi:

R₁₂ =R₁ +R₂ = 3 Ohms + 3 Ohms = 6 Ohms

Resistor R12 ndi resistor 3 zimalumikizidwa pamodzi. Resistor yolowa m'malo ndi:

1/R = 1/R₁₂ + 1/R₃ = 1/6 + 1/6 = 2/6

R = 6/2 = 3 Ohms

Mphamvu yamagetsi:

I = V / R = 6 / 3 = 2 Ampere

Yankho lolondola ndi C.

10. Onani chithunzi cha closed circuit pansipa! Mphamvu yonse yamagetsi mu dera ndi...

A. 0,5 A

B. 0,6 A

C. 1,2 A

D. 2,0 A

Zokambirana

Amadziwika kuti:

Wotsutsa R₁ = 6 Ohms

Wotsutsa R₂ = 4 Ohms

Mphamvu yamagetsi (V) = 6 Volts

Kukana kwamkati (r) = 0,6 Ohm

Anafunsa kuti: Mphamvu yonse yamagetsi mu dera

Yankho:

Wotsutsa R₁ ndi chotsutsa R₂ cholumikizidwa motsatizana. Chotsukira cholowa m'malo ndi:

1 / R_P = 1/R1 + 1/R2 = 1/6 + 1/4 = 4/24 + 6/24 = 10/24

R_P = 24/10 = 2,4 Ohms

Wotsutsa R_P ndipo kukana kwamkati (r) kumalumikizidwa motsatizana. Kukana kofanana ndi:

R = R_P + r = 2,4 Ohms + 0,6 Ohms = 3,0 Ohms

Mphamvu yonse yamagetsi mu dera ndi:

I = V / R = 6 Volts / 3 Ohms = 2 Amps

Yankho lolondola ndi D.

11.

Yang'anani dera lamagetsi lomwe lili m'mbali! Kukula kwa magetsi a V ndi…

A. 9,6 Volt
B. 6,4 Volt
C. 4,5 Volt
D. 3,2 Volt

Zokambirana

Amadziwika kuti:
Wotsutsa 1 (R)₁) = 16 Ohms
Wotsutsa 2 (R)₂) = 8 Ohms
Wotsutsa 3 (R)₃) = 6 Ohms
Mphamvu yamagetsi (I) = 2 Ampere
Funso: Voltage yamagetsi (V)
Yankho:
Choletsa cholowa m'malo
R₁ ndi R₂ cholumikizidwa motsatizana. Choletsa cholowa m'malo ndi:
R_A =R₁ +R₂ = 16 + 8 = 24 Ohms
R_A ndi R₃ cholumikizidwa motsatizana. Chotsukira cholowa m'malo ndi:
1/R = 1/R_A + 1/R₃ = 1/24 + 1/6
1/R = 1/24 + 4/24 = 5/24
R = 24/5 = 4,8 Ohms
Mphamvu yamagetsi :
V = IR = (2)(4,8) = 9,6 Volts
Yankho lolondola ndi A.

12. Yang'anani chithunzi cha magetsi chomwe chili m'mbali! Ngati kukana kwa magetsi komwe kumachokera sikunyalanyazidwa, ndiye kuti voltmeter V imasonyeza voltage yoyezedwa ya...

A. 4 V
B. 6 V
C. 9 V
D. 10 V

Zokambirana

Amadziwika kuti:
Wotsutsa 1 (R)₁) = 3,6 Ohms
Wotsutsa 2 (R)₂) = 6 Ohms
Wotsutsa 3 (R)₃) = 4 Ohms
Mphamvu yamagetsi (I) = 1,5 Ampere
Funso: Voltage yamagetsi (V)
Yankho:
Choletsa cholowa m'malo
R₂ ndi R₃ cholumikizidwa motsatizana. Chotsukira cholowa m'malo ndi:
1 / R_A = 1/R₂ + 1/R₃ = 1/6 + 1/4
1 / R_A = 2/12 + 3/12 = 5/12
R_A = 12/5 = 2,4 Ohms
R₁ ndi R_A cholumikizidwa motsatizana. Choletsa cholowa m'malo ndi:
R = R₁ +R_A = 3,6 + 2,4 = 6 Ohms
Mphamvu yamagetsi :
V = IR = (1,5)(6) = 9 Volts
Yankho lolondola ndi C.

13.
Yang'anani chithunzi chotsatira cha magetsi chotsekedwa! Ngati kukana mu gwero la magetsi E sikunyalanyazidwa, ndiye kuti voltmeter V imasonyeza voltage yoyezedwa ya...
A. 2 V
B. 4 V
C. 6 V
D. 12 V
Zokambirana
Amadziwika kuti:
Wotsutsa 1 (R)₁) = 3 Ohms
Wotsutsa 2 (R)₂) = 2 Ohms
Wotsutsa 3 (R)₃) = 4 Ohms
Mphamvu yamagetsi (I) = 2 Ampere
Funso: Voltage yamagetsi (V)
Yankho:
Choletsa cholowa m'malo
R₂ ndi R₃ cholumikizidwa motsatizana. Choletsa cholowa m'malo ndi:
R_A =R₂ +R₃ = 2 + 4 = 6 Ohms
R₁ ndi R_A cholumikizidwa motsatizana. Chotsukira cholowa m'malo ndi:
1/R = 1/R₁ + 1/R_A = 1/3 + 1/6
1/R = 2/6 + 1/6 = 3/6
R = 6/3 = 2 Ohms
Mphamvu yamagetsi :
V = IR = (2)(2) = 4 Volts
Yankho lolondola ndi B.

14. Mu chithunzi chotsatira cha magetsi, A, B, C, D ndi E ndi nyali zofanana za incandescent.

Ngati nyali B yachotsedwa, nyali yomwe imawala kwambiri imakhala...

A. magetsi A ndi C

B. magetsi A ndi D

C. nyali C ndi D

D. nyali C ndi E

E. nyali D ndi E

Zokambirana

Nyali zisanu zofanana zoyatsira magetsi zimatanthauza kuti nyali iliyonse ili ndi kukana kofanana.

Chifukwa kukana kwake kuli kofanana, kuwala kwa nyali kumadalira mphamvu ya magetsi omwe akuyenda mu nyaliyo.

Malinga ndi lamulo loyamba la Kirchhoff, magetsi odutsa mu nyali D ndi E ndi ofanana chifukwa amalumikizidwa motsatizana, pomwe magetsi odutsa mu dera lofanana adzagawidwa.

Ngati nyali B yachotsedwa, nyali zomwe zimayaka kwambiri ndi nyali D ndi E, pomwe nyali zonse ziwiri zimakhala ndi lawi lowala lomwelo.

Yankho lolondola ndi E.

15. Yang'anani chithunzi chotsatira cha magetsi!

Ngati gwero la magetsi lili ndi kusiyana kwa ma volts 24, mphamvu yamagetsi pa nthambi I ndi…

A. 1,2 A

B. 2,0 A

C. 2,4 A

D. 3,0 A

Zokambirana

Amadziwika kuti:

Gwero la EMF (E) = 24 Volts

Kukana kwamkati (r) = 2 Ohm

Zotsutsa 40 Ohm, 20 Ohm ndi 20 Ohm.

Anafunsa kuti: Mphamvu yomwe ilipo pakadali pano pa nthambi yoyamba

Yankho:

Ma resistors atatuwa alumikizidwa pamodzi, ma resistors olowa m'malo ndi awa:

1/R = 1/40 + 1/20 + 1/20

1/R = 1/40 + 2/40 + 2/40

1/R = 5/40

R = 40/5

R = 8 Ohm

Mphamvu yolumikizira magetsi:

V = E – I r

V = 24 – I 2

Mphamvu yomwe ilipo pakali pano pa nthambi yoyamba:

V = IR

24 – Ine 2 = Ine 8

24 = Ine 8 + Ine 2

24 = Ine (10)

Ine = 24/10

I = 2,4 Ampere

Yankho lolondola ndi C.

Gwero la funso:

Mafunso a Mayeso a Sayansi ya Sukulu ya Sekondale/Chisilamu cha Sukulu ya Sekondale

Mafunso a SBMPTN a Fizikiki