Electro Magnetic Induction And Alternating Currents Question 249

Question: A transformer is employed to reduce 220 V to 11 V. The primary draws a current of 5 A and the secondary 90 A. The efficiency of the transformer is [MP PMT 1992, 2001, 04]

Options:

A) 20%

B) 40%

C) 70%

D) 90%

Show Answer

Answer:

Correct Answer: D

Solution:

$ \eta =\frac{V_{s}i_{s}}{V_{p}i_{p}}\times 100=\frac{11\times 90}{220\times 5}\times 100=90\ % $



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