Question

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

• A. $\raisebox{1ex}{$1$}\!\left/ \!\raisebox{-1ex}{$20$}\right.A$
• B. $20A$
• C. $100A$
• D. $2A$

Answer 1

The correct option is B

$20A$

Step 1: Given data

Number of the turns in the primary winding, $N_p=1000$

Number of the turns in the secondary winding, $N_s=50$

Current in primary windings, $I_p=1A$

Supply Voltage $=220V$

Step 2: Finding the output current of the transformer.

We know that,

Current in the secondary windings,

$I_s=\left(\frac{N_p}{N_s}\right)I_p$

Where $I_s$ is the current in the secondary winding.

$I_s=\left(\frac{1000}{50}\right)\times 1$

$I_s=20A$

Hence, option B is correct.