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NEET 2021
Exam
NEET
Year
2021
Subject
Physics
Chapter
Alternating Current

NEET 2021 · Physics · Alternating Current

A step down transformer connected to an ac mains supply of 220V is...

A step down transformer connected to an ac mains supply of 220V220V is made to operate at 11V,44W11V, 44W lamp. Ignoring power losses in the transformer, what is the current in the primary circuit?

Options

  1. A2A2A
  2. B0.4A0 . 4A
  3. C0.2A0 . 2A
  4. D4A4A

Correct answer

C. 0.2A0 . 2A

Step-by-step solution

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

So, Input Power, P1=44W{P}_{1} = 44W

⇒V1i1=P1⇒ {V}_{1}{i}_{1} = {P}_{1}

⇒i1=P1V1=44220=0.2A⇒ {i}_{1} = \dfrac{{P}_{1}}{{V}_{1}} = \dfrac{44}{220} = 0 . 2A

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