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Transformer

The number of...

Question

The number of turns of the primary and the secondary coils of a transformer are $20$ and $200$ respectively. Primary voltage and the current are given as $5 V$ and $1 A .$ Assuming the efficiency to be $90 %,$ the secondary voltage and current are

50 V

and

0.09 A

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50 V

and

10 A

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50 V

and

0.11 A

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0.5 V

and

9.0 A

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Solution

The correct option is A $50 V$ and $0.09 A$
$\frac{v_{s}}{v_{p}} = \frac{N_{s}}{N_{p}}$
$V_{s} = 50 v$
$50 \times l_{s} = 0.9 \times 5 \times 1$
$l_{s} = 0.09 A$

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