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% C. 90% T noti B. 60% D. 80%

Answers 2

Answer:

i don't know the answer. .cufhzj

Answer:

Correct option is D

Given,

The mains current is 0.5A.

The mains voltage is 220V.

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

The efficiency is n= (output/input) ×100

= 100/(220×0.5) ×100

=90.9

The approximate efficiency of transformer is 90%.

Therefore the correct option D.

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