Question

A transformer of 100% efficiency has 200 turns in the primary and 40,000 turns in secondary. It is connected to a 220V main supply and secondary feeds to a $100k\Omega$ resistance. The potential difference per turn is:

• A. 1.1V
• B. 25V
• C. 18V
• D. 11V

Answer 1

The correct option is A 1.1V

From a transformer ratio
$\frac{V_S}{V_P}\frac{N_S}{N_P}\frac{V_S}{220}=\frac{40000}{200}$
P.d per turn $=\frac{V_S}{N_S}=\frac{44000}{40000}=1.1V$