Zitsanzo 8 za mafunso okhudza mphamvu zamagetsi ndi mphamvu
1. Nyali yamagetsi yolembedwa 220 V - 5 A imagwiritsidwa ntchito kwa mphindi 30, kotero mphamvu yomwe nyali imafuna ndi…
A. 33 kJ
B. 330 kJ
C. 1.980 kJ
D. 19.800 kJ
Zokambirana
Voltifomu (V) = 220 Volti
Mphamvu ya pakali pano (I) = 5 Ampere
Nthawi (t) = mphindi 30 = masekondi 30 x 60 = masekondi 1800
Fomula ya Mphamvu Yamagetsi (P):
P = VI = (220 Volt) (5 Ampere) = 1100 Volt Ampere = 1100 Watt = 1100 Joule/sekondi imodzi
Mphamvu yamagetsi = Mphamvu yamagetsi x nthawi = (1100 Joules/sekondi) (masekondi 1800)
Mphamvu yamagetsi = 1.980.000 Joules = 1.980 kilo Joules
Yankho lolondola ndi C.
2. Chitsulo chosungunula chimalembedwa kuchokera ku fakitale kuti 220 V - 60 W. Ngati chidacho chayatsidwa kwa mphindi 4, mphamvu yamagetsi ndi…
A. 240J
B. 880 J
C. 14.400 J
D. 52.800 J
Zokambirana
Amadziwika kuti:
Mphamvu (P) = 60 Watt = 60 Joules/sekondi
Voltifomu (V) = 220 Volti
Nthawi (t) = mphindi 4 = masekondi 4 x 60 = masekondi 240
Yafunsidwa: Mphamvu zamagetsi
Yankho:
Ma Volt 220 – Ma Watt 60 amatanthauza kuti chitsulo chosungunula chamagetsi chimagwira ntchito bwino ngati kusiyana komwe kungatheke kapena magetsi amagetsi ndi ma volts 220 ndipo chili ndi mphamvu ya ma Watts 60 = 60 Joules/sekondi, zomwe zikutanthauza kuti chitsulo chosungunula chamagetsi chimagwiritsa ntchito ma Joules 60 a mphamvu pa sekondi.
Mphamvu yamagetsi = mphamvu yamagetsi x nthawi = (60 Joules/sekondi) (masekondi 240) = 14.400 Joules.
Yankho lolondola ndi C.
3. Mphamvu yomwe chitsulo chimagwiritsa ntchito kwa mphindi imodzi ndi 33 kJ ndipo imalumikizidwa ku voltage ya 220 volts, kotero magetsi omwe akuyenda mu chitsulo ndi...
A. 0,067 A
B. 0,40 A
C. 2,50 A
D. 15,0 A
Zokambirana
Amadziwika kuti:
Nthawi yopuma (t) = mphindi imodzi = masekondi 60
Mphamvu (W) = 33 kiloJoules = 33.000 Joules
Voltifomu (V) = 220 Volti
Funso: Mphamvu yamagetsi (I)
Yankho:
Mphamvu yamagetsi ndi mphamvu yamagetsi yomwe imagwiritsidwa ntchito kwa nthawi inayake. Mwa masamu:
P = W / t = 33.000 Joules / masekondi 60
P = 550 Watt
Fomula yomwe imafotokoza ubale pakati pa magetsi, magetsi ndi mphamvu yamagetsi ndi iyi:
P = VI
Kuti muwerenge mphamvu yamagetsi (I), fomula iyi imasinthidwa kukhala:
I = P / V = 550 / 220 = 2,5 Ampere
Yankho lolondola ndi C.
4. Nyumba imagwiritsa ntchito zipangizo zamagetsi monga momwe zalembedwera patebulo lotsatira.
Kodi mphamvu zamagetsi zingati zimagwiritsidwa ntchito mu mwezi umodzi (masiku 30)?
A. 120 kWh
B. 60 kWh
C. 40 kWh
D. 20 kWh
Zokambirana
Amadziwika kuti:
Mphamvu ya nyali = 4 (10 Watt) = 40 Watt ndipo nthawi yogwiritsira ntchito nyali = maola 10 x 30 = maola 300
Mphamvu ya TV = 100 Watts ndipo nthawi yogwiritsira ntchito firiji = maola 10 x 30 = maola 300
Mphamvu yachitsulo = 300 Watts ndipo nthawi yogwiritsira ntchito chitsulo = maola awiri x 30 = maola 60
Funso: Mphamvu yamagetsi yomwe yagwiritsidwa ntchito mwezi umodzi
Yankho:
Mphamvu yamagetsi = mphamvu yamagetsi x nthawi
Mphamvu yomwe nyali imagwiritsa ntchito = (40 Watt)(maola 300) = maola 12.000 Watt = 12 kilo Watt maola = 12 kWh
Mphamvu yogwiritsidwa ntchito ndi TV = (100 Watt) (maola 300) = maola 30.000 Watt = 30 kilo Watt maola = 30 kWh
Mphamvu yomwe chitsulo chimagwiritsa ntchito = (300 Watt) (maola 60) = 18.000 Watt maola = 18 kilo Watt maola = 18 kWh
Mphamvu yonse yamagetsi yomwe yagwiritsidwa ntchito = 12 kWh + 30 kWh + 18 kWh = 60 kWh.
Yankho lolondola ndi B.
5. M'nyumba, muli nyali 5 za ma watt 25 zomwe zimayatsidwa maola 14 patsiku, firiji ya ma watt 200 yomwe imayatsidwa maola 24 patsiku, ndi pampu yamadzi ya ma watt 125 yomwe imayatsidwa maola 8 patsiku. Kodi mphamvu zamagetsi zingati zomwe zimagwiritsidwa ntchito mwezi umodzi (masiku 30)?
A. 226,5 kWh
B. 144 kWh
C. 52,5 kWh
D. 30 kWh
Zokambirana
Amadziwika kuti:
Mphamvu ya nyali = 5(25) = 125 Watts ndipo nthawi yogwiritsira ntchito nyali = maola 14 x 30 = maola 420
Mphamvu ya firiji = 200 Watts ndipo nthawi yogwiritsira ntchito firiji = maola 24 x 30 = maola 720
Mphamvu ya pampu yamadzi = 125 Watts ndipo nthawi yogwiritsira ntchito pampu yamadzi = maola 8 x 30 = maola 240
Funso: Mphamvu yamagetsi yomwe yagwiritsidwa ntchito mwezi umodzi
Yankho:
Mphamvu yamagetsi = mphamvu yamagetsi x nthawi
Mphamvu (nyali) = (125 Watt) (maola 420) = maola 52.500 Watt = maola 52,5 Watt
Mphamvu (firiji) = (200 Watt) (maola 720) = maola 144.000 Watt = maola 144 Watt
Mphamvu (pampu yamadzi) = (125 Watt) (maola 240) = maola 30.000 Watt = maola 30 Watt
Mphamvu yonse yamagetsi yomwe yagwiritsidwa ntchito = 52,5 + 144 + 30 = 226,5 kilo Watt maola = 226,5 kilo Watt maola = 226,5 kWh.
Yankho lolondola ndi A.
6. Mu shopu yogulitsira zitsulo, pali nyali ziwiri za ma watt 20 zomwe zimayatsidwa kwa maola 7 patsiku, nyali ya ma watt 440 yomwe imagwiritsidwa ntchito kwa maola 4 patsiku, ndi TV ya ma watt 50 yomwe imayatsidwa kwa maola atatu patsiku. Kodi mphamvu zamagetsi zingati zomwe zimagwiritsidwa ntchito mwezi umodzi (masiku 30)?
A. 65,70 kWh
B. 52,80 kWh
C. 32,87 kWh
D. 16,43 kWh
Zokambirana
Amadziwika kuti:
Mphamvu ya nyali = 2(20) = 40 Watts ndipo nthawi yogwiritsira ntchito nyali = maola 7 x 30 = maola 210
Mphamvu yothira soldering = 440 Watts ndipo nthawi yothira soldering = maola 4 x 30 = maola 120
Mphamvu ya TV = 50 Watts ndipo nthawi yogwiritsira ntchito TV = maola atatu x 30 = maola 90
Funso: Mphamvu yamagetsi yomwe yagwiritsidwa ntchito mwezi umodzi
Yankho:
Mphamvu yamagetsi = mphamvu yamagetsi x nthawi
Mphamvu (nyali) = (40 Watt) (maola 210) = maola 8.400 Watt = maola 8,4 Watt
Mphamvu (kusungunula) = (440 Watt) (maola 120) = maola 52.800 Watt = maola 52,8 Watt
Mphamvu (TV) = (50 Watt) (maola 90) = maola 4.500 Watt = maola 4,5 Watt
Mphamvu yonse yamagetsi yomwe yagwiritsidwa ntchito = 8,4 + 52,8 + 4,5 = 65,7 kilo Watt maola = 65,7 kilo Watt maola = 65,7 kWh.
Yankho lolondola ndi A.
7. Banja limakhala ndi nyali 5 za ma watts 20 zomwe zimayatsidwa maola 10 patsiku, TV ya ma watts 60 yomwe imayatsidwa maola 8 patsiku, ndi firiji ya ma watts 150 yomwe imayatsidwa maola 24 patsiku. Kodi magetsi amagwiritsidwa ntchito angati pamwezi umodzi (masiku 30)?
A. 548,64 kWh
B. 388,80 kWh
C. 188,00 kWh
D. 152,40 kWh
Amadziwika kuti:
Mphamvu ya nyali = 5(20) = 100 Watts ndipo nthawi yogwiritsira ntchito nyali = maola 10 x 30 = maola 300
Mphamvu ya TV = 60 Watts ndipo nthawi yogwiritsira ntchito TV = maola atatu x 30 = maola 240
Mphamvu ya firiji = 150 Watts ndipo nthawi yogwiritsira ntchito firiji = maola 24 x 30 = maola 720
Funso: Mphamvu yamagetsi yomwe yagwiritsidwa ntchito mwezi umodzi
Yankho:
Mphamvu yamagetsi = mphamvu yamagetsi x nthawi
Mphamvu (nyali) = (100 Watt) (maola 300) = maola 30.000 Watt = maola 30 Watt
Mphamvu (TV) = (60 Watt) (maola 240) = maola 14.400 Watt = maola 14,4 Watt
Mphamvu (firiji) = (150 Watt) (maola 720) = maola 108.000 Watt = maola 108 Watt
Mphamvu yonse yamagetsi yomwe yagwiritsidwa ntchito = 30 + 14,4 + 108 = 152,4 kilo Watt maola = 152,4 kilo Watt maola = 152,4 kWh.
Yankho lolondola ndi D.
8. Samalani ndi deta yotsatirayi yokhudza kugwiritsa ntchito zida zamagetsi!
Kuchuluka kwa mphamvu zamagetsi zomwe zimagwiritsidwa ntchito ndi zida zitatu zamagetsi zomwe zili pamwambapa ndi…
A. 158.400 Joule
B. 950.400 Joule
C. 5.860.800 Joule
D. 9.504.000 Joule
Zokambirana
Kugwiritsa ntchito mphamvu pa wailesi yakanema:
P = VI = (220 Volt) (0,3 Ampere) = 66 Volt Ampere = 66 Watt = 66 Joule/sekondi imodzi
Mphamvu ya kompyuta:
P = VI = (220 Volt) (0,4 Ampere) = 88 Volt Ampere = 88 Watt = 88 Joule/sekondi imodzi
Mphamvu ya pampu yamadzi:
P = VI = (220 Volt) (0,5 Ampere) = 110 Volt Ampere = 110 Watt = 110 Joule/sekondi imodzi
Nthawi:
Maola 10 = masekondi 10 x 3600 = masekondi 36.000
Maola 6 = masekondi 6 x 3600 = masekondi 21600
Maola 4 = masekondi 4 x 3600 = masekondi 14400
Mphamvu yamagetsi = mphamvu yamagetsi x nthawi
Mphamvu zamagetsi zomwe zimagwiritsidwa ntchito ndi TV = 66 Joules/sekondi x 36.000 masekondi = 2.376.000 Joules
Mphamvu yamagetsi yomwe kompyuta imagwiritsa ntchito = 88 Joules/sekondi x 21600 masekondi = 1.900.800 Joules
Mphamvu yamagetsi yomwe imagwiritsidwa ntchito ndi pampu yamadzi = 110 Joules/sekondi x 14400 masekondi = 1.584.000 Joules
Mphamvu yonse yamagetsi:
Ma Joules 2.376.000 + Ma Joules 1.900.800 + Ma Joules 1.584.000 = Ma Joules 5.860.800
Yankho lolondola ndi C.
Gwero la funso:
Mafunso a Mayeso a Sayansi ya Sukulu ya Sekondale/Chisilamu cha Sukulu ya Sekondale
