Question

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

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

Answer 1

Answer: (B)

50 A

Answer 2

$\frac{N_{s}}{N_{p}} = \frac{i_{p}}{i_{s}}$ or $\frac{25}{1} = \frac{i_{p}}{2} \Rightarrow i_{p} = 50A$