A transformer is used to light 100 W 25 volt lamp from 250 Volt ac ma – McqOptions

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1.	A transformer is used to light 100 W 25 volt lamp from 250 Volt ac mains. The current in the main cable is 0.5 A. Calculate the efficiency of the transformer.
A.	50%
B.	60%
C.	90%
D.	80%
Answer» E.

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