Question

A transformer of 100% efficiency has 200rums in the primary and 40000 turns in secondary. It is connected to a 220 V main supply and secondary feeds to a 100 $K\Omega$ resistance. The potential difference per turn is

• A. 1.1V
• B. 25V
• C. 18V
• D. 11 V

Answer 1

Answer: (A)

1.1V

Answer 2

From transformer ratio $\frac{{{V}_{s}}}{{{V}_{p}}}=\frac{{{N}_{s}}}{{{N}_{p}}}$ $\Rightarrow$ ${{V}_{s}}=\frac{{{V}_{p}}\times {{N}_{s}}}{{{N}_{p}}}$ $=\frac{220V\times 40000}{200}=44000\,V$ Potential difference per turn is $\frac{{{V}_{s}}}{{{N}_{s}}}=\frac{44000V}{40000}=1.1\,V$