Question

The primary winding of a transformer has $100$ turns and its secondary winding has $200$turns. The primary is connected to an A.C supply of $120$V and the current flowing in it is $10$A. The voltage and the current in the secondary are

• A. $240V,5A$
• B. $240V,10A$
• C. $60V,20A$
• D. $120V,20A$

Answer 1

Answer: (A)

$240V,5A$

$\frac{E_s}{E_p}=\frac{n_s}{n_p}{E}_s=E_p\times \left(\frac{n_s}{n_p}\right)$
$\therefore E_s=120\times \left(\frac{200}{100}\right)=240V$
$\frac{I_p}{I_s}=\frac{n_s}{n_p}{I}_s=I_p\times \left(\frac{n_p}{n_s}\right)\therefore I_s=10\left(\frac{100}{200}\right)=5A$