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Physics · PYQ NEET UG 2023
हिन्दीA \( 12\text{ V} \), \( 60\text{ W} \) lamp is connected to the secondary of a step down transformer, whose primary is connected to ac mains of \( 220\text{ V} \). Assuming the transformer to be ideal, what is the current in the primary winding?
Correct answer · Option B
\( 0.27\text{ A} \)
Explanation
For an ideal transformer, input power = output power. \( P_p = P_s = 60\text{ W} \). Primary current \( I_p = P_p / V_p = 60 / 220 \approx 0.27\text{ A} \).
