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If the primary coil of a transformer has 100 turns and the secondary has 200 turns. Then for a input of 220 V at 10 A find output current, in step up transformer.

Asked in GUJCET 2024 · Transformers

• (1) 50.0 A
• (2) 0.05 A
• (3) 0.5 A
• (4) 5.0 A

Step-by-step solution

Why the other options are wrong

• (1) No slip with these numbers produces 50.0 A; it is the answer with the decimal point moved one place. Sanity check: the secondary sits at 440 V, so 50 A out would be 22 kW against the 2.2 kW going in — ten times more power out than in.
• (2) Divides the turns ratio by the primary current instead of multiplying: (100/200)/(10)=0.05 A. The relation is Iₛ=Iₚ(Nₚ)/(Nₛ), so the 10 A belongs on top.
• (3) Stops at the turns ratio itself, (Nₚ)/(Nₛ)=(100)/(200)=0.5, and reads it as a current. It is only a factor; it still has to multiply Iₚ=10 A.

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