Zitsanzo 6 za mafunso okhudza mphamvu zamagetsi
1. Wophunzira amayatsa TV kwa maola 6 patsiku. TV imalumikizidwa ndi magetsi a 220 Volt, kotero mphamvu yamagetsi yomwe imayenda mu TV ndi 0,5 Ampere. Ngati PLN ikhazikitsa mtengo wa Rp. 600,00/kWh, ndiye kuti mtengo wogwiritsa ntchito TV kwa mwezi umodzi (masiku 30) ndi….
A. Rp. 9.900,00
B. Rp. 11.880,00
C. Rp. 19.800,00
D. Rp. 23.760,00
Zokambirana
Amadziwika kuti:
Nthawi yogwiritsira ntchito TV = maola 6 x 30 = maola 180
Voltifomu (V) = 220 Volti
Mphamvu ya pakali pano (I) = 0,5 Ampere
Mtengo wamagetsi = Rp. 600,00 / kWh
Funso: Mtengo wogwiritsira ntchito magetsi pa TV kwa mwezi umodzi (masiku 30)
Yankho:
Mphamvu ya wailesi yakanema:
P = VI = (220 Volt) (0,5 Ampere) = 110 Volt Ampere = 110 Watt
Mphamvu yamagetsi = mphamvu yamagetsi x nthawi yopuma
Mphamvu yamagetsi ya pa TV = 110 Watt x maola 180 = maola 19800 Watt = 19,8 kilo Watt maola = 19,8 kilo Watt maola = 19,8 kWh
Mtengo wogwiritsira ntchito magetsi pa TV kwa mwezi umodzi:
19,8 kWh x Rp. 600,00 / kWh = Rp. 11.880,00
Yankho lolondola ndi B.
2. M'nyumba, muli nyali zinayi za 20W, nyali ziwiri za 10W, ndi nyali zitatu za 40W zomwe zimayatsidwa kwa maola 5 tsiku lililonse. Ngati mtengo wamagetsi pa kWh ndi Rp 500,00, ndiye kuti mtengo womwe uyenera kulipidwa mkati mwa mwezi umodzi (masiku 30) ndi...
A. Rp. 5.625,00
B. Rp. 7.500,00
C. Rp. 12.750,00
D. Rp. 16.500,00
Zokambirana
Amadziwika kuti:
Nyali 4 20 Watt = 4 x 20 Watts = 80 Watts
Nyali 2 10 Watt = 2 x 10 Watts = 20 Watts
Nyali 3 40 Watt = 3 x 40 Watts = 120 Watts
Mphamvu yonse (W) = 80 Watts + 20 Watts + 120 Watts = 220 Watts
Nthawi yopuma (t) = maola 5 x 30 = maola 150
Mtengo wamagetsi pa kWh = Rp. 500,00
Yafunsidwa: Ndalama zomwe ziyenera kulipidwa mkati mwa mwezi umodzi
Yankho:
Mphamvu yamagetsi = Mphamvu yamagetsi x Nthawi yopuma = 220 Watt x maola 150 = maola 33000 Watt = 33 kilo Watt maola = 33 kilo Watt maola = 33 kWh
Ndalama zolipirira:
(33 kWh) (Rp 500,00/kWh) = Rp 16.500
Yankho lolondola ndi D.
3. Nyumba ya a Budi imagwiritsa ntchito zida zamagetsi zomwe zili ndi nyali zitatu za 20 W iliyonse, nyali zitatu za 40 W iliyonse, zomwe zonse zimagwiritsidwa ntchito maola 12 patsiku. Pampu imodzi yamadzi ya 250 W imagwiritsidwa ntchito maola 4 patsiku ndipo chitsulo cha 300 W chimagwiritsidwa ntchito maola awiri patsiku. Ngati mtengo wamagetsi ndi Rp. 600,00 / kWh, bilu yamagetsi yomwe a Budi ayenera kulipira kwa mwezi umodzi (masiku 30) ndi…..
A. Rp. 57.680,00
B. Rp. 59,680.00
C. Rp. 64.820,00
D. Rp. 67.680,00
Zokambirana
Amadziwika kuti:
Mphamvu ya nyali = 3 (20 Watt) + 3 (40 Watt) = 60 Watt + 120 Watt = 180 Watt ndipo nthawi yogwiritsira ntchito nyali = maola 12 x 30 = maola 360
Mphamvu ya pampu yamadzi = 250 Watts ndipo nthawi yogwiritsira ntchito pampu yamadzi = maola 4 x 30 = maola 120
Mphamvu yachitsulo = 300 Watts ndipo nthawi yogwiritsira ntchito chitsulo = maola awiri x 30 = maola 60
Mtengo wamagetsi Rp. 600,00 / kWh
Funso: Ndalama zolipirira mwezi umodzi (masiku 30)
Yankho:
Mphamvu yamagetsi = mphamvu yamagetsi x nthawi
Mphamvu ya nyali = (180 Watt)(maola 360) = maola 64.800 Watt = maola 64,8 Watt
Mphamvu ya pampu yamadzi = (250 Watt) (maola 120) = maola 30.000 Watt = maola 30 Watt
Mphamvu yachitsulo = (300 Watt) (maola 60) = maola 18.000 Watt = maola 18 Watt
Mphamvu yonse yamagetsi yomwe yagwiritsidwa ntchito = 64,8 + 30 + 18 = 112,8 kilo Watt maola = 112,8 kilo Watt maola = 112,8 kWh.
Mtengo wolipira mwezi umodzi = (112,8 kWh)( Rp. 600,00 / kWh) = Rp. 67.680
Yankho lolondola ndi D.
4. Nyumba imagwiritsa ntchito zipangizo zamagetsi zotsatirazi tsiku ndi tsiku...
Kodi mphamvu zamagetsi zingati zimagwiritsidwa ntchito mu mwezi umodzi (masiku 30)?
A. 146 kWh
B. 78 kWh
C. 52 kWh
D. 26 kWh
Zokambirana
Amadziwika kuti:
Mphamvu ya nyali yoyaka = 5 x 20 Watt = 100 Watt ndipo nthawi yogwiritsira ntchito nyali yoyaka = maola 12 x 30 = maola 360
Mphamvu ya nyali ya Neon = 6 x 10 Watt = 60 Watt ndipo nthawi yogwiritsira ntchito nyali ya incandescent = maola 10 x 30 = maola 300
Mphamvu ya wailesi yakanema = 1 x 80 Watt = 80 Watt ndipo nthawi yogwiritsira ntchito wailesi yakanema = maola 10 x 30 = maola 300
Funso: Kodi mphamvu zamagetsi zingati zomwe zimagwiritsidwa ntchito kwa masiku 30?
Yankho:
Mphamvu yamagetsi = mphamvu yamagetsi x nthawi yopuma
Mphamvu yamagetsi ya nyali yoyaka = 100 Watt x maola 360 = maola 36.000 Watt = 36 kilo Watt maola = 36 kWh
Mphamvu yamagetsi ya nyali ya neon = 60 Watt x maola 300 = maola 18.000 Watt = 18 kilo Watt maola = 18 kWh
Mphamvu yamagetsi ya pa TV = 80 Watt x maola 300 = maola 24.000 Watt = 24 kilo Watt maola = 24 kWh
Mphamvu yonse yamagetsi = 36 kWh + 18 kWh + 24 kWh = 78 kWh
kWh = kilo Watt ola = kilo Watt ola
Yankho lolondola ndi B.
5. Yang'anani chithunzi cha chipangizo chamagetsi chomwe chili pansipa! Mphamvu yamagetsi ya chipangizocho yalembedwa pachithunzichi ndipo chipangizocho chagwiritsidwa ntchito kwa mphindi 30, kenako kuchuluka kwa mphamvu yamagetsi yomwe yagwiritsidwa ntchito ndi…..
A. 396 ma kilojoule
B. 540 kilo Joule
C. 600 kilo Joule
D. 900 kilo Joule
Zokambirana
Amadziwika kuti:
Mphamvu yamagetsi (P) = 300 Watt = 300 Joules / sekondi
Nthawi yopuma (t) = mphindi 30 = 30 (masekondi 60) = masekondi 1800
Funso: Kodi mphamvu zamagetsi zimagwiritsidwa ntchito zingati?
Yankho:
Mphamvu ya ma Joules 300 pa sekondi imatanthauza kuti chitsulo chimagwiritsa ntchito ma Joules 300 a mphamvu sekondi iliyonse. Ngati chigwiritsidwa ntchito kwa masekondi 1800, chitsulocho chimagwiritsa ntchito ma Joules 540.000 a mphamvu zamagetsi = ma kilojoules 540.
Yankho lolondola ndi B.
6. Banja limagwiritsa ntchito mphamvu zamagetsi kwa mwezi umodzi (masiku 30) pa zipangizo zamagetsi monga momwe zasonyezedwera patebulo lotsatira!
Mphamvu yamagetsi ya makina ochapira, TV ndi AC ndi…
Zokambirana
Mphamvu yamagetsi ya makina ochapira = 12 kWh = maola 12.000 Watt, nthawi yogwiritsira ntchito = maola awiri x 30 = maola 60
Mphamvu yamagetsi ya TV = 19,2 kWh = maola 19.200 Watt, nthawi yogwiritsira ntchito = maola 8 x 30 = maola 240
Mphamvu yamagetsi ya AC = 72 kWh = maola 72.000 Watt, nthawi yogwiritsira ntchito = maola 6 x 30 = maola 180
Mphamvu yamagetsi = mphamvu yamagetsi / nthawi
Mphamvu ya makina ochapira = maola 12.000 a Watt / maola 60 = 200 watts
Mphamvu ya TV = maola 19.200 a Watt / maola 240 = 80 Watts
Mphamvu ya AC = maola 72.000 a Watt / maola 180 = 400 Watts
Yankho lolondola ndi B.
Gwero la funso:
Mafunso a Mayeso a Sayansi ya Sukulu ya Sekondale/Chisilamu cha Sukulu ya Sekondale
