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A transformer having efficiency of 90% is working on 200 V and 3kw power supply. If the current in the secondary coil is 6 A, the voltage across the secondary coil and the current in the primary coil respectively are.

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300 V, 15 A

450 V, 13.5 A

600 V, 15 A

450 V, 15 A

answer is B.

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Detailed Solution

$i_{1} = \frac{p}{V} = \frac{3000}{200} = 15;$
$P_{o u t} = η p_{i n p u t}; V_{2} i_{2} = η \times p_{i n p u t}$

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