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Transformer

For the given...

Question

For the given transformer, the ratio of number of turns in primary and secondary coils is $1 : 7$ . If the input voltage and current are $50$ V and $5$ A respectively then the value of output current is ____A.

0.71

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0.97

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35

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9

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Solution

The correct option is A $0.71$
Given,

$N_{1} : N_{2} = 1 : 7$

$V_{1} = i n p u t v o l t a g e = 50 V$

$I_{1} = i n p u t c u r r e n t = 5 A$

$N_{1} =$ number of turns in primary

Let

$V_{2} = o u t p u t v o l t a g e$

$I_{2} = o u t p u t c u r r e n t$

$N_{2} =$ number of turns in secondary

We have

$\frac{V_{1}}{V_{2}} = \frac{I_{2}}{I_{1}}$

$\frac{1}{7} = \frac{I_{2}}{5}$

$5 = 7 I_{2}$

$I_{2} = \frac{5}{7} = 0.71 A$

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