Question

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

• A. 25 A
• B. 50 A
• C. 15 A
• D. 12.5 A

Answer 1

Answer: (B)

50 A

Answer 2

For a transformer , $\frac{I_p}{I_s} = \frac{N_s}{N_p} \, i.e. \, I_p = \frac{N_s}{N_p} \times I_p = \frac{25}{1} \times 2$ = 50 A