Question

A step-down transformer has primary voltage $1100$ $V$. The ratio of turns of primary to secondary coil is $5:1$. If the primary current is $10A$ then what is the secondary voltage and secondary current assuming the transformer to be an ideal transformer ?

• A. $220V$, $50A$
• B. $220V$, $5A$
• C. $22V,50A$
• D. $22V,5A$

Answer 1

The correct option is A $220V$, $50A$

For transformer the transformation ratio is

$\frac{V_p}{V_s}=5$

$\frac{1100}{V_s}=5$

$V_s=220V$

now, equating power transfered

$V_p{i}_p=V_s{i}_s$

$1100\times 10=220\times i_s$

$i_s=50A$