A step down transformer connected to an AC mains supply of 220 V is made to operate at 11 V , 44 W lamp.…

A step down transformer connected to an AC mains supply of 220 V is made to operate at 11 V, 44 W lamp. Ignoring power losses in the transformer, what is the current in the primary circuit?
  1. 2 A
  2. 0.4 A
  3. 0.2 A
  4. 4 A

Solution

Power loss is zero. Hence, output Power is equal to input Power.

So, Input Power, P1=44 W

⇒V1i1=P1

⇒i1=P1V1=44220=0.2 A

Asked in: NEET 2021

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