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  4. A step-up transformer has the turns in the ratio of 1:20. A resistance of 100Ω connected across the secondary is drawing a current of 2A. The primary voltage and the current, respectively, are

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Q. A step-up transformer has the turns in the ratio of $1:20.$ A resistance of $100Ω$ connected across the secondary is drawing a current of $2A.$ The primary voltage and the current, respectively, are

NTA AbhyasNTA Abhyas 2020

Solution:

For ideal transformer
$\frac{N_{2}}{N_{1}}=\frac{E_{2}}{E_{1}}=\frac{i_{1}}{i_{2}}\Rightarrow \frac{20}{1}=\frac{i_{1}}{2}$
$\Rightarrow i_{1}=40A$ and $E_{1}=200\times \frac{1}{20}=10V$