A transformer is employed to reduce \( 220 \mathrm{~V} \) to \( 11 \mathrm{~V} \). The primary d...
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0A transformer is employed to reduce \( 220 \mathrm{~V} \) to \( 11 \mathrm{~V} \). The primary draws a current of \( 5 \mathrm{~A} \) and the secondary \( 90 \mathrm{~A} \). The efficiency of the transformer is
(A) \( 20 \% \)
(B) \( 70 \% \)
(C) \( 40 \% \)
(D) \( 90 \% \)
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