A step up transformer operates on a $230 V$ line and supplies to a load $2 A$ . The ratio of primary to secondary windings is $1 : 25$ . Determine the primary current.

8.8 A

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12.5 A

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25 A

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50 A

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Solution

The correct option is B $50 A$
We have for step up transformer $\frac{V_{S}}{V_{P}} = \frac{N_{S}}{N_{P}} = \frac{I_{P}}{I_{S}}$
Given $\frac{N_{S}}{N_{P}} = \frac{25}{1}, I_{S} = 2 A$
$∴ \frac{25}{1} = \frac{I_{P}}{2} \Rightarrow I_{P} = 50 A$

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A step up transformer operates on a 230V line and supplies to a load 2A. The ratio of primary to secondary windings is 1:25. Determine the primary current.

The correct option is B 50AWe have for step up transformer VSVP=NSNP=IPISGiven NSNP=251,IS=2A∴251=IP2⇒IP=50A

A step up transformer operates on a $230 V$ line and supplies to a load $2 A$ . The ratio of primary to secondary windings is $1 : 25$ . Determine the primary current.

The correct option is B $50 A$
We have for step up transformer $\frac{V_{S}}{V_{P}} = \frac{N_{S}}{N_{P}} = \frac{I_{P}}{I_{S}}$
Given $\frac{N_{S}}{N_{P}} = \frac{25}{1}, I_{S} = 2 A$
$∴ \frac{25}{1} = \frac{I_{P}}{2} \Rightarrow I_{P} = 50 A$