Mienzaniso mishanu yeMibvunzo yeSimba reMagetsi
1. Rambi reTL rine zita rekuti 10 W, 220 V. Izvi zvinoreva kuti rambi rinoda...
A. simba 10 J/sekondi uye simba remagetsi 0,045 A
B. simba 10 J/sekondi uye simba remagetsi 22 A
C. simba 10 J/min uye simba remagetsi 0,045 A
D. simba 10 J/miniti uye simba remagetsi 22 A
Kukurukurirana
Zvinozivikanwa kuti:
Simba (P) = 10 Watts
Voltage (V) = 220 Volts
Akabvunzwa: rambi rinoda…..
Mhinduro:
Simba remwenje = 10 Watt = 10 Joules/sekondi.
Izvi zvinoreva kuti rambi iri rinoshandisa simba remaJoules gumi pasekondi.
Fomura yehukama huripo pakati pesimba remagetsi, voltage yemagetsi uye magetsi emagetsi:
P = VI
Tsananguro: P = simba remagetsi , V = voltage yemagetsi, I = magetsi emagetsi
Saka magetsi emagetsi ndeaya:
I = P / V = 10 / 220 = 1/22 = 0,045 Ampere
Mhinduro chaiyo ndiA.
2. Tarisa mufananidzo! Simba remagetsi riri mudunhu iri...
A. 2 watts
B. 24 watts
C. 48 watts
D. 72 watts
Kukurukurirana
Zvinozivikanwa kuti:
Mudziviriri 1 (R1 ) = 6 Ω
Mudziviriri 2 (R2 ) = 6 Ω
Mhepo yemagetsi (V) = 24 Volts
Akabvunzwa: Simba remagetsi
Mhinduro:
Chinodzivirira chinotsiva:
R1 naR2 zvakabatana zvakatevedzana. Zvinotsiva zvinotsiva ndeizvi :
R = R 1 + R 2 = 6 Ω + 6 Ω = 12 Ω
Simba remagetsi:
I = V/R = 24/12 = 2 Ampere
Simba remagetsi:
P = VI = (24)(2) = 48 Watts = 48 Joules/sekondi
3. Makirowatt matatu emagetsi anofambiswa nevoltage ye150 volts. Hukuru hwemagetsi ari kuyerera...
A. 10 Ampere
B. 20 Ampere
C. 30 Amperes
D. 40 Amperes
Kukurukurirana
Zvinozivikanwa kuti:
Simba remagetsi (P) = 3 kilo Watt = 3000 Watt
Mhepo yemagetsi (V) = 150 Volts
Mubvunzo: Simba remagetsi (I)
Mhinduro:
Fomura inotaura hukama huripo pakati pesimba remagetsi, voltage yemagetsi uye magetsi emagetsi:
P = VI
Verenga magetsi uchishandisa fomura iri pamusoro apa:
Ini = P/V
I = 3000 Watts / 150 Volts
I = 20 Amperes
Mhinduro chaiyo ndeiyi B.
4. Imba inoshandisa marambi mana e20-watts, marambi maviri e60-watts, uye TV ye60-watts. Inobatidzwa kwemaawa masere pazuva. Kana magetsi achidhura Rp 111,30 pa kWh, inodhura marii kwemwedzi mumwe chete (mazuva makumi matatu)?
Kukurukurirana
Zvinozivikanwa kuti:
Marambi mana emagetsi makumi maviri = 4 x 20 Watts = 80 Watts
Marambi mana emagetsi makumi maviri = 2 x 60 Watts = 120 Watts
60 Watts TV = 60 Watts
Huwandu hwesimba rakashandiswa:
Mawati 80 + Mawati 120 + Mawati 60 = Mawati 260
Nguva yekuzorora = maawa masere x 30 = maawa mazana maviri nemakumi mana
Mubvunzo: Mari yekubhadhara kwemwedzi mumwe chete (mazuva makumi matatu)
Mhinduro:
Simba = Simba x Nguva = 260 Watt x maawa 240 = maawa 62400 Watt = 62,4 kilo Watt maawa = 62,4 kWh
Mutengo = 62,4 kWh x Rp. 111,30 = Rp. 6945,12
5. Zvinhu zviviri zvinopisa zvemagetsi zvinogadzirwa newaya mbiri dzakafanana dzine dhayamita ye1 mm ne2 mm, imwe neimwe yakareba 2 m. Kana waya mbiri dzakabatana nemhepo imwechete, zvinoreva kuti chiyero chiri pakati pesimba rinogadzirwa newaya dzedhayamita ye1 mm ne2 mm ndeche…
A. 1: 1
B. 1: 2
C. 1 : 4
D. 2: 1
Chikamu 4: 1
Kukurukurirana
Fomura yekudzivisa magetsi uye kupikisa kwakananga:
Tsananguro: R = kuramba, ρ = kuramba kwakananga, l = kureba kwemutyairi, A = nzvimbo yepamusoro yemutyairi
Fomura yemutemo weOhm:
V = IR
Tsananguro: V = magetsi emagetsi, I = magetsi emagetsi, R = kudzivirira magetsi
Fomura yesimba remagetsi:
P = VI
P = (IR) I
P = I 2 R
Zvichibva pafomura iri pamusoro, simba remagetsi (P) rinoenderana nedhayamita yewaya (d):
Chiyero chiripo pakati pesimba rinogadzirwa newaya ine dhayamita ye1 mm ne2 mm ndeichi:
4: 1
Mhinduro chaiyo ndiE.
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