A transformer is used to light \( 140 \mathrm{~W}, 24 \mathrm{~V} \...

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A transformer is used to light \( 140 \mathrm{~W}, 24 \mathrm{~V} \) lamp from \( 240 \mathrm{~V} \) a.c. mains. The current in the mains cable is \( 0.7 \mathrm{~A} \). The efficiency of transformer is
(1) \( 63.8 \% \)
(2) \( 48 \% \)
(3) \( 83.3 \% \)
(4) \( 34 \% \)
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