A step-up transformer operates on $220 \mathrm{~V}$ and supplies current of $2 \mathrm{~A}$. The ratio of…

A step-up transformer operates on $220 \mathrm{~V}$ and supplies current of $2 \mathrm{~A}$. The ratio of primary and secondary windings is $1: 20$. The current in the primary is
  1. $5 A$
  2. $2 A$
  3. $40 A$
  4. $20 A$

Solution

$\begin{aligned} & \frac{N_{\mathrm{s}}}{N_p}=20=\frac{I_p}{I_s} \\ & \therefore I_p=20 I_S \\ & =20 \times 2=40 \mathrm{~A}\end{aligned}$

Asked in: MHT CET 2021 (23 Sep Shift 1)

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