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NEET 2007 Physics question

PhysicsAlternating CurrentNEET 2007

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

Answer: (4)

Solution

Output power (power used by the lamp) W. Input power W. Efficiency $η =

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Question ID VK-089921