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A transformer is employed to reduce 220 ...

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

A

0.2

B

0.4

C

0.7

D

0.9

Text Solution

Verified by Experts

The correct Answer is:
D
`eta = (V_s i_s)/(V_p i_p) xx 100 = (11 xx 90)/(220 xx 5) xx 100 = 90%`
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