Q. The primary winding of a transformer has 100 turns and its secondary winding has 200 turns. The primary is connected to an ac supply of $120\ V$ and the current flowing in it is $10\ A$. The voltage and the current in the secondary are
A) $240\ V,\ 5\ A$
B) $240\ V,\ 10\ A$
C) $60\ V,\ 20\ A$
D) $120\ V,\ 20\ A$
Explanation
(a) $\frac{N_{s}}{N_{p}} = \frac{V_{s}}{V_{p}} \Rightarrow \frac{200}{100} = \frac{V_{s}}{120} \Rightarrow V_{s} = 240\ V$
Also $\frac{V_{s}}{V_{p}} = \frac{i_{p}}{i_{s}} \Rightarrow \frac{240}{120} = \frac{10}{i_{s}} \Rightarrow i_{s} = 5\ A$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.