Q. 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) $12.5\ A$
Explanation
(b) $\frac{N_{s}}{N_{p}} = \frac{i_{p}}{i_{s}}$ or $\frac{25}{1} = \frac{i_{p}}{2} \Rightarrow i_{p} = 50\ A$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.