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Question 20202
JEE Physics · Medium

Electromagnetic Induction and Alternating Current: Transformer — Current Ratio MCQ

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Transformer — Current RatioMediumQuestion 20202

Question

An ideal transformer steps voltage up by factor 5. The current in the secondary compared to primary is:
  1. A
    5 times larger
  2. B
    5 times smaller
    Correct
  3. C
    Equal
  4. D
    25 times smaller

Correct answer

5 times smaller

Explanation

Power conservation: V₁I₁ = V₂I₂. If V₂ = 5V₁, then I₂ = I₁/5 — current is stepped down when voltage is stepped up.

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