Alternating Current - Result Question 37

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

[2007]

(a) 50

(b) 90

(c) 10

(d) 30.

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Answer:

Correct Answer: 39. (b)

Solution:

  1. (b) Efficiency of the transformer

η=Poutput Pinput ×100=100220×0.5×100=90.9



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