AIPMT PRELIMS 2010 Physics Transformers MCQ Question
A 220 V/440 V step-up transformer. The output circuit draws a current of 2.0 ampere at 440 volts. If the efficiency of the transformer is 80%, the current drawn by the primary windings of the transformer is
5.0 ampere
3.6 ampere
2.8 ampere
2.5 ampere
Correct Answer
Detailed Explanation
The primary current I₁ is calculated using the formula I₁ = (E₂ * I₂) / (η * E₁). Substituting the given values: I₁ = (440 * 2) / (0.8 * 220) = 5 Å.
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