A 12 V, 60 W lamp is connected to the secondary of a step-down transformer, whose primary is connected to ac mains of 220 V. Assuming the transformer to be ideal, what is the current in the primary winding?

1. A. 0.27 A
2. B. 2.7 A
3. C. 3.7 A
4. D. 0.37 A

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