May/June 2026 Paper 23

2026 · 40 questions · 40 parts · 40 marks

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33Transformers Power TransmissionHard1 mark
A 12 V, 36 W lamp shines at normal brightness when connected to a mains transformer. Assume the transformer is 100% efficient.
a transformer with a 1200-turn primary coil connected to 240 V a.c. mains, wound on an iron core with a secondary coil connected to a 12 V, 36 W lamp
Which row shows the number of turns in the secondary coil and the current in the mains wires?
number of turns in secondary coilcurrent in the mains wire / A
A600.15
B603.0
C1800.15
D1803.0