5 mau laʻana o nā nīnau mana uila
1. Ua kapa ʻia ke kukui TL he 10 W, 220 V. ʻO ke ʻano kēia, pono ke kukui...
A. ikehu 10 J/kekona a me ke au 0,045 A
B. ikehu 10 J/kekona a me ke au 22 A
C. ikehu 10 J/min a me ke au o 0,045 A
D. ikehu 10 J/minuke a me ke au 22 A
Pahana
Ua ʻike ʻia:
Mana (P) = 10 Watts
Uila uila (V) = 220 Volts
Nīnau ʻia: pono ke kukui…..
Pane:
Mana kukui = 10 Watt = 10 Joules/kekona.
ʻO ke ʻano kēia, hoʻopau kēia kukui i 10 Joules/kekona o ka ikehu.
ʻO ke ʻano hana no ka pilina ma waena o ka mana uila, ka uila uila a me ke au uila:
P = VI
Wehewehe: P = mana uila , V = uila uila, I = au uila
No laila, ʻo ke au uila:
ʻO I = P / V = 10 / 220 = 1/22 = 0,045 Ampere
ʻO A ka pane pololei.
2. E nānā i ke kiʻi! ʻO ka mana uila i loko o kēia kaapuni he...
A. 2 watt
B. 24 watt
C. 48 watt
D. 72 watt
Pahana
Ua ʻike ʻia:
Palekana 1 (R 1 ) = 6 Ω
Kū'ē 2 (R 2 ) = 6 Ω
Ka uila uila (V) = 24 Volts
Nīnau ʻia: Mana uila
Pane:
Pale kū'ē pani:
Hoʻopili ʻia ʻo R 1 a me R 2 ma ke ʻano he moʻo. ʻO nā resistors pani:
R = R 1 + R 2 = 6 Ω + 6 Ω = 12 Ω
Ikaika o ke au uila:
ʻO I = V/R = 24/12 = 2 Ampere
Mana uila:
P = VI = (24)(2) = 48 Watts = 48 Joules/kekona
3. Hoʻouna ʻia he 3 kilowatts o ka mana uila ma kahi volta o 150 volts. ʻO ka nui o ke au e kahe ana...
A. 10 Amperes
B. 20 Amperes
C. 30 Amperes
D. 40 Amperes
Pahana
Ua ʻike ʻia:
Mana uila (P) = 3 kilo Watt = 3000 Watt
Ka uila uila (V) = 150 Volts
Nīnau: Ka ikaika o ke au uila (I)
Pane:
ʻO ke ʻano hana e hōʻike ana i ka pilina ma waena o ka mana uila, ka uila uila a me ke au uila:
P = VI
E helu i ke au uila me ka hoʻohana ʻana i ke ʻano ma luna:
ʻO wau = P / V
ʻO I = 3000 Watts / 150 Volts
ʻO I = 20 Amperes
ʻO ka pane pololei ʻo B.
4. Hoʻohana kahi hale i 4 mau kukui 20-watt, 2 mau kukui 60-watt, a me kahi TV 60-watt. Hoʻā ʻia ia no ka awelika o 8 mau hola i ka lā. Inā he Rp 111,30 ke kumukūʻai o ka uila no kēlā me kēia kWh, ehia ke kumukūʻai no 1 mahina (30 mau lā)?
Pahana
Ua ʻike ʻia:
4 mau kukui 20 Watt = 4 x 20 Watts = 80 Watts
2 mau kukui 60 Watt = 2 x 60 Watts = 120 Watts
60 Watt TV = 60 Watts
Ka nui o ka mana i hoʻohana ʻia:
80 Watts + 120 Watts + 60 Watts = 260 Watts
Ka manawa = 8 hola x 30 = 240 hola
Nīnau: Nā kumukūʻai e uku ʻia no 1 mahina (30 lā)
Pane:
Ikehu = Mana x Manawa = 260 Watt x 240 hola = 62400 Watt hola = 62,4 kilo Watt hola = 62,4 kWh
Kumukuai = 62,4 kWh x Rp. 111,30 = Rp. 6945,12
5. Hana ʻia ʻelua mau mea hoʻomehana uila me ʻelua mau uea like me ke anawaena o 1 mm a me 2 mm, ʻo kēlā me kēia 2 m ka lōʻihi. Inā pili nā uea ʻelua i ke kumu uila like, a laila ʻo ka lakio ma waena o ka mana i hana ʻia e nā uea 1 mm a me 2 mm ke anawaena…
A. 1 : 1
B. 1 : 2
K. 1 : 4
D. 2 : 1
E. 4 : 1
Pahana
ʻO ke ʻano hana no ke kū'ē uila a me ke kū'ē kikoʻī:
Wehewehe: R = ke kū'ē, ρ = ke kū'ē kiko'ī, l = ka lōʻihi o ke alakaʻi, A = ka ʻili o ke alakaʻi
ʻO ke ʻano hana o ke kānāwai o Ohm:
V = IR
Wehewehe: V = uila uila, I = au uila, R = pale uila
Haʻilula mana uila:
P = VI
P = (IR) I
P = I 2 R
Ma muli o ke ʻano ma luna, ua like ka mana uila (P) me ke anawaena uea (d):
ʻO ka lakio ma waena o ka mana i hana ʻia e kahi uea 1 mm a me 2 mm ke anawaena:
4: 1
ʻO ka pane pololei ʻo E.
Puna nīnau:
Nā Nīnau Hoʻokolohua ʻEpekema Lahui no ke Kula Kiʻekiʻe Haʻahaʻa/Kula Kiʻekiʻe ʻIslama
Nā Nīnau Physics SBMPTN
