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Q.

A transformer changes 220V to 22V. If the currents in the primary and secondary coils are 10A and 70A respectively then its efficiency will be

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a

20%

b

60%

c

70%

d

40%

answer is C.

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Detailed Solution

$η = \frac{V_{2} i_{2}}{V_{1} i_{1}} \times 100$

= $\frac{22 \times 70}{220 \times 10} \times 100$

= 70%

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