A 12 V , 60 W lamp is connected to the secondary of a step down transformer, whose primary is connected to…

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. 0.37 A
  2. 0.27 A
  3. 2.7 A
  4. 3.7 A

Solution

For an ideal transformer,

Powerinput=Poweroutput⇒VPIP=Poweroutput⇒IP=60220≈0.27 A

Asked in: NEET 2023 (All India)

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