A 220 V input is supplied to a transformer. The output circuit draws a current of 2.0 A at 440 V. If the efficiency of the transformer is 80%, the current drawn by the primary windings of the transformer is:
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Question

A 220 V input is supplied to a transformer. The output circuit draws a current of 2.0 A at 440 V. If the efficiency of the transformer is 80%, the current drawn by the primary windings of the transformer is:

Options

G1 Physics · Accepted Answer

Step 1: Secondary output power is Pₛ=VₛIₛ=440×2=880W. Step 2: Efficiency η=Pₛ/Pₚ=0.80 implies Pₚ=880/0.8=1100W. Step 3: At primary voltage 220V, Iₚ=Pₚ/Vₚ=1100/220=5.0A. Answer D. Final answer: (D) 5.04 | ;.