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Turns Ratio

If the curren...

Question

If the current in the primary coil and number of turns in it are $I_{p}$ and $N_{p}$ respectively and the number of turns and current in the secondary are Ns and Is respectively then the value of $N_{s} : N_{p}$ will be

A

I_{s} : I_{p}

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B

I_{p} : I_{s}

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C

I_{s}^{2} : I_{p}^{2}

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D

I_{p}^{2} : I_{s}^{2}

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Solution

The correct option is B $I_{p} : I_{s}$
$\frac{N_{p}}{N_{s}} = \frac{V_{p}}{V_{s}}$

Power in transformer remains constant , $P = V I$

$V \propto 1 / I$

$\frac{N_{P}}{N_{S}} = \frac{I_{S}}{I_{P}}$

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