Q 12-07-010NEETNEET 2021Top questionEasy
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 ?
Answer: (B) $0.2$ A
Concept. No losses: primary power $=$ secondary power.
Step 1. Primary current. $I_p = \dfrac{44}{220} = 0.2$ A.
Answer. $0.2$ A (Option B).
Solution by Sreeraj P, M.Sc Physics