Question

A step-up transformer has transformation ratio of 3 : 2. What is the voltage in secondary if voltage in primary is 30 V

• A. 45 V
• B. 15 V
• C. 90 V
• D. 300 V

Answer 1

Answer: (A)

45 V

Answer 2

$\frac{V_{s}}{V_{p}} = \frac{N_{s}}{N_{p}} = k \Rightarrow \frac{V_{s}}{30} = \frac{3}{2} \Rightarrow V_{s} = 45\mspace{6mu} V$