Question

A step down transformer has 50 turns on secondary and 1000 turns on primary winding. If a transformer is connected to $220V,1A$ A.C. source, what is output current of the transformer?

• A. $\frac{1}{20}A$
• B. 20 A
• C. 100 A
• D. 2 A

Answer 1

The correct option is B 20 A

Number of turns on secondary winding $N_s=50$

Number of turns on primary winding $N_p=1000$

Current in the primary winding $I_p=1$ A

$\therefore$ Current in the secondary winding $I_s=\frac{N_p}{N_s}{I}_p$

$⟹$ $I_s=\frac{1000}{50}\times 1=20$ A