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A transformer having efficiency of \( 90 \% \) is working
\( \mathrm{P} \) on \( 200 \mathrm{~V} \) and \( 3 \mathrm{~kW} \) power supply. If the current in the secondary coil is \( 6 \mathrm{~A} \), the voltage across the
W secondary coil and the current in the primary coil respectively are:
(1) \( 300 \mathrm{~V}, 15 \mathrm{~A} \)
(2) \( 450 \mathrm{~V}, 15 \mathrm{~A} \)
(3) \( 450 \mathrm{~V}, 13.5 \mathrm{~A} \)
(4) \( 600 \mathrm{~V}, 15 \mathrm{~A} \)
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