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Alternating Current question

2021 · Q164
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Alternating Current question

2021 · Q164

NEETPhysicsAlternating CurrentMCQ+4 / −1
A step down transformer connected to an ac mains supply of 220 V is made to operate at 11 V, 44W lamp. Ignoring power losses in the transformer, what is the current in the primary circuit ?
  1. A
    4A
  2. B
    0.2A
  3. C
    0.4A
  4. D
    2A
View written solutionFree

Correct answer: B

Power loss = 0

η\eta η = 100%

Pin = Po/p

VPIp = VSIs

220 ×\times× Ip = 44

Ip = 44220=15{{44} \over {220}} = {1 \over 5}22044​=51​A = .2A

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