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

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

Option: 1

50%


Option: 2

90%


Option: 3

10%


Option: 4

30%


Answers (1)

best_answer

 

Given that the main current is 0.5A.

The mains voltage is 220V.

Power of light =100W and voltage V=110V

The efficiency is n=inputoutput?×100=220 × 0.5100?×100=90.9

The approximate efficiency of a transformer is 90%.

 

Posted by

Riya

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