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Physics - EMI/AC Question with Solution | TestHub

PhysicsEMI/ACTransformerEasy2 minPYQ_2020

PhysicsEasysingle choice

A transformer is used to light a $100 W$ and $110 V$ lamp from a $220 V$ mains. If the main current is $0.5 A$ . The efficiency of the transformer is approximately -

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Answer:

Solution:

Efficiency of Transformer $= \frac{P o w e r o u t p u t}{P o w e r i n p u t}$

$% η = \frac{P_{o u t}}{P_{i n}} \times 100 = \frac{100}{220 \times 0.5} \times 100 = 90 %$

Subject:PhysicsTopic:EMI/ACSubtopic:Transformer

⏱ 2mℹ️ Source: PYQ_2020

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