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Direct Current vs. Alternating Current

Turn ratio of...

Question

Turn ratio of a step-up transformer is $1 : 25$ . If current in load coil is $2 A$ , then the current in primary coil will be :

A

25

A

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B

50

A

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C

0.25

A

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D

0.5

A

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Solution

The correct option is B $50$ A
Ratio of step up transformer $\frac{1}{25} = \frac{I_{s}}{I_{p}}$
$⟹ \frac{1}{25} = \frac{2}{I_{p}}$
$⟹ I_{p} = 50 A$

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