Physicsmedium · Past Paper
A step-down transformer has 400 turns in the primary and 100 turns in the secondary. If input voltage is 220V, what is the output voltage?
A880 V
B440 V
C55 V
D110 V
✓ Correct Answer: C — 55 V
Vs/Vp = Ns/Np. Vs = Vp * (Ns/Np) = 220 * (100/400) = 220 / 4 = 55V.
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