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Sebuah transformer dibina daripada teras besi berlamina dengan gegelung primer 40 lilitan disambungkan kepada bekalan a.u. dan gegelung sekunder 12 lilitan disambungkan kepada sebuah mentol kecil. Mentol menyala pada nilai kadarannya 6.0 V dan 250 mA. Anggap tiada tenaga hilang.
Cari arus dalam gegelung primer, dalam ampere.
A transformer is made from a laminated iron core with a 40-turn primary coil fed from an a.c. supply; its 12-turn secondary coil drives a small lamp. The lamp lights at its rated values of 6.0 V and 250 mA. Assume no energy is lost.
Find the current in the primary coil, in amperes.
Bahasa Melayu
Sebuah transformer dibina daripada teras besi berlamina dengan gegelung primer 40 lilitan disambungkan kepada bekalan a.u. dan gegelung sekunder 12 lilitan disambungkan kepada sebuah mentol kecil. Mentol menyala pada nilai kadarannya 6.0 V dan 250 mA. Anggap tiada tenaga hilang.
Cari arus dalam gegelung primer, dalam ampere.
English
A transformer is made from a laminated iron core with a 40-turn primary coil fed from an a.c. supply; its 12-turn secondary coil drives a small lamp. The lamp lights at its rated values of 6.0 V and 250 mA. Assume no energy is lost.
Find the current in the primary coil, in amperes.
[3 marks]
🧭Modelled on SBP trial 2026 · Kertas 2 · Q9(c)(ii)
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