A transformer is employed to reduce \( 220 \mathrm{~V} \) to \( 11 ...

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A transformer is employed to reduce \( 220 \mathrm{~V} \) to \( 11 \mathrm{~V} \).
\( \mathrm{P} \) The primary draws a current of \( 5 \mathrm{~A} \) and the secondary

W \( 90 \mathrm{~A} \). The efficiency of the transformer is
(1) \( 20 \% \)
(2) \( 40 \% \)
(3) \( 70 \% \)
(4) \( 90 \% \)
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