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. 0.2 A

2. 0.4 A

3. 2 A

4. 4 A

Doubtly Asked 30 Oct 2026 NEET UG 2021 Practice test neet Save WhatsApp Report

1 answer

Best answer

Answer: 1. 0.2 A

Key idea: with no losses, input power = output power = 44 W.

\(I_p=\dfrac{P}{V_p}=\dfrac{44}{220}=0.2\) A. Option 1. (The secondary current is \(44/11=4\) A, which is option 4's trap.)

Doubtly AI · 30 Oct 2026 AI-generated · not yet verified Report

Was this answer helpful?