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Transformer

A transformer...

Question

A transformer has an efficiency of $80$ %. It works at $4 kW$ and $100 V$ . If the secondary voltage is $240 V$ , the current in primary coil is

0.4 A

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4 A

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10 A

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40 A

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Solution

The correct option is B $40 A$
As, $E_{p} I_{p} = P_{i}$
$∴$ $I_{p} = \frac{P_{i}}{E_{p}} = \frac{4000}{100} = 40 A$

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