NEET2021Physics-Electromagnetic Induction
NEET 2021 Physics Transformers MCQ Question
Type: MCQ-numerical-Easy-Class 12
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?
A
0.2 Å
B
0.4 Å
C
2 Å
D
4 Å
Correct Answer
Option A
Detailed Explanation
The power in the secondary circuit is 44 W, so the current is 44/11 = 4 Å. Using the transformer equation VpIp = VsIs, we have 220 * Ip = 11 * 4, giving Ip = 0.2 Å.
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