Question

The number of turns in primary coil of a transformer is $20$ and the number of turns in the secondary is $10$. If the voltage across the primary is $220 \,V$, what is the voltage across the secondary?

• A. 110 V
• B. 130 V
• C. 190 V
• D. 310 V

Answer 1

Answer: (A)

110 V

Answer 2

Given, $N_{p}=20, N_{S}=10, e_{p}=220\,V$ $\therefore$ Transformation ratio, $k$ $\frac{e_{s}}{e_{p}}=\frac{N_{S}}{N_{P}}$ or $e_{S}=\frac{N_{S}}{N_{P}} \times e_{P}$ $=\frac{10}{20} \times 220=110\,V$