Physicshard · Past Paper
In a transformer, if the efficiency is 80%, input power is 1000W, and output voltage is 200V, find the output current.
A5 A
B4 A
C10 A
D0.8 A
✓ Correct Answer: B — 4 A
Efficiency = P_out / P_in. 0.8 = P_out / 1000 => P_out = 800W. I_out = P_out / V_out = 800 / 200 = 4 Amperes.
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