A transformer with 1200 primary turns steps 230 V down to 11.5 V. How many turns are on its secondary?
Correct answer A. 60
Explanation
Nₛ = Nₚ × Vₛ/Vₚ = 1200 × 11.5/230 = 1200 × 0.05 = 60 turns. Using the inverse ratio gives 24 000 turns, which would be a step-up transformer.
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