An ideal transformer has primary voltage 15 V and secondary-to-primary turns ratio 4:1. What is its secondary voltage?

A) 30 V

B) 90 V

C) 120 V

D) 60 V

Answer: D

Explanation: Use voltage ratio = secondary turns ÷ primary turns for the stated idealized conditions. Substitution gives 15 × 4 = 60 V.

Scroll to Top