Mehlala e 5 ea Lipotso tsa Matla a Motlakase
1. Lebone la TL le ngotswe ka 10 W, 220 V. Sena se bolela hore lebone le hloka…
A. matla 10 J/motsotsoana le hona joale 0,045 A
B. matla 10 J/motsotsoana le hona joale 22 A
C. matla 10 J/min le hona joale 0,045 A
D. matla 10 J/motsotso le hona joale 22 A
Puisano
Hoa tsebahala hore:
Matla (P) = 10 Watts
Setegangan (V) = 220 Volt
O botsitse: Lebone le hloka...
Karabo:
Matla a lebone = 10 Watt = 10 Joules/motsotsoana.
Sena se bolela hore lebone lena le ja matla a 10 Joules/motsotswana.
Foromo ea kamano pakeng tsa matla a motlakase, motlakase oa motlakase le motlakase oa hona joale:
P = VI
Tlhaloso: P = matla a motlakase, V = motlakase oa motlakase, I = motlakase oa motlakase
Kahoo motlakase oa motlakase ke:
Ke = P / V = 10 / 220 = 1/22 = 0,045 Ampere
Karabo e nepahetseng ke A.
2. Sheba setšoantšo! Matla a motlakase potolohong ena ke...
A. 2 watt
B. 24 watts
C. 48 watts
D. 72 watts
Puisano
Hoa tsebahala hore:
Mohanyetsi 2 (R)2) = 6 Ω
Motlakase oa motlakase (V) = Li-volt tse 24
O botsitse: Matla a motlakase
Karabo:
Sehanyetsi se nkelang sebaka:
R1 le R2 e hokahantsoe ka letoto. Resistor e nkelang sebaka ke:
R = R1 + R2 = 6 Ω + 6 Ω = 12 Ω
Matla a motlakase:
Ke = V/R = 24/12 = 2 Ampere
Matla a motlakase:
P = VI = (24)(2) = 48 Watts = 48 Joule/motsotswana
3. Li-kilowatt tse 3 tsa motlakase li fetisoa ka li-volt tse 150. Boholo ba phallo ea motlakase ke...
A. 10 Li-ampere
B. 20 Ampere
C. 30 Ampere
D. 40 Ampere
Puisano
Hoa tsebahala hore:
Matla a motlakase (P) = 3 kilo Watt = 3000 Watt
Motlakase oa motlakase (V) = Li-volt tse 150
O botsitse: Motlakase (I)
Karabo:
Foromo e hlalosang kamano pakeng tsa matla a motlakase, motlakase oa motlakase le motlakase oa hona joale:
P = VI
Bala motlakase o sebelisang foromo e kaholimo:
Ke = P / V
I = 3000 Watts / 150 Volts
I = 20 Ampere
Karabo e nepahetseng ke B.
4. Ntlo e sebelisa mabone a mane a 20-watt, mabone a mabeli a 60-watt, le TV ea 60-watt. E buloa ka karolelano ea lihora tse 8 ka letsatsi. Haeba motlakase o bitsa Rp 111,30 ka kWh, o tla bitsa bokae khoeling e le 'ngoe (matsatsi a 30)?
Puisano
Hoa tsebahala hore:
Mabone a 4 a 20 Watt = 4 x 20 Watts = 80 Watts
Mabone a 2 a 60 Watt = 2 x 60 Watts = 120 Watts
TV ea li-watt tse 60 = li-watt tse 60
Bongata ba matla a sebelisitsoeng:
Li-watt tse 80 + Li-watt tse 120 + Li-watt tse 60 = Li-watt tse 260
Nako e sa fellang = lihora tse 8 x 30 = lihora tse 240
O botsitse: Litefiso tse lokelang ho lefshoa khoeli e le 'ngoe (matsatsi a 30)
Karabo:
Matla = Matla x Nako = Li-watt tse 260 x lihora tse 240 = Lihora tsa li-watt tse 62400 = Lihora tsa li-watt tse 62,4 kilo = 62,4 kWh
Litšenyehelo = 62,4 kWh x Rp. 111,30 = Rp. 6945,12
5. Dikarolo tse pedi tsa ho futhumatsa motlakase di entswe ka dithapo tse pedi tse tshwanang tse bophara ba 1 mm le 2 mm, e nngwe le e nngwe e le bolelele ba 2 m. Haeba dithapo tse pedi di hokahantswe le mohlodi o tshwanang wa motlakase, jwale karolelano pakeng tsa dihlahiswa tsa motlakase tsa dithapo tsa 1 mm le 2 mm ke…
K. 1: 1
B. 1: 2
C. 1: 4
D. 2: 1
E. 4: 1
Puisano
Foromo ea khanyetso ea motlakase le khanyetso e itseng:
Tlhaloso: R = khanyetso, ρ = khanyetso e itseng, l = bolelele ba mokhanni, A = sebaka sa bokaholimo ba mokhanni
Foromo ea molao oa Ohm:
V = IR
Tlhaloso: V = motlakase, I = motlakase, R = khanyetso ea motlakase
Foromo ea matla a motlakase:
P = VI
P = (IR) I
P = I2 R
Ho latela foromo e kaholimo, matla a motlakase (P) a lekana ka tsela e fapaneng le bophara ba terata (d):
Karolelano pakeng tsa matla a hlahisoang ke terata ea bophara ba 1 mm le 2 mm ke:
4: 1
Karabo e nepahetseng ke E.
Mohloli oa lipotso:
Lipotso tsa Tlhahlobo ea Naha ea Saense ea Sekolo se Phahameng sa Bana ba Banyenyane/Sekolo se Phahameng sa Boislamo
Lipotso tsa Fisiks tsa SBMPTN
