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A step-up transformer operates on a \( 230 \mathrm{~V} \) line and a load current of \( 2 \mathrm{~A} \). The ratio of primary
and secondary windings is \( 1: 25 \). Then the current in the primary is
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and secondary windings is \( 1: 25 \). Then the current in the primary is
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The correct answer is:
\( 50 \mathrm{~A} \)
Transformer operates on \( 230 \mathrm{~V} \) line; load current \( =2 \mathrm{~A} \)
Ratio of primary and secondary windings, \( \frac{N_{P}}{N_{S}}=\frac{1}{25} \)
Since, \( \frac{N_{s}}{N_{p}}=\frac{I_{p}}{I_{s}} \)
\( \Rightarrow I_{p}=\frac{N_{s}}{N_{p}} \times I_{s} \) \( \Rightarrow I_{p}=\frac{25}{1} \times 2=50 \)
Therefore, current in primary \( =50 \mathrm{~A} \)
Ratio of primary and secondary windings, \( \frac{N_{P}}{N_{S}}=\frac{1}{25} \)
Since, \( \frac{N_{s}}{N_{p}}=\frac{I_{p}}{I_{s}} \)
\( \Rightarrow I_{p}=\frac{N_{s}}{N_{p}} \times I_{s} \) \( \Rightarrow I_{p}=\frac{25}{1} \times 2=50 \)
Therefore, current in primary \( =50 \mathrm{~A} \)
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