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Question

The turn ratio is 1:25. The step-up transformer operates at 230V and the current through the secondary is 2A. Then, current in the primary is


A

25A

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B

100A

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C

50A

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D

20A

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Solution

The correct option is C

50A


Step 1: Given Data

Turn ratio, NP:NS=1:25

Where NP is the number of turns in the primary coil and NS is the number of turns in the secondary coil,

Current through the secondary coil IS=2A

Let the current through the primary coil be IP.

Step 2: Formula Used

NPNS=ISIP

Step 3: Calculate the Current

We know that for a step-up transformer,

NPNS=ISIPIP=NSNP×IS=251×2=50A

Hence, the correct answer is option (C).


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