Q. In a transformer the number of primary turns is four times that of the secondary turns. Its primary is connected to an $AC$ source of voltage $V$. Then,
J & K CETJ & K CET 2015Alternating Current
Solution:
For a transformer, ratio of voltages in primary and secondary can be written as
$\frac{V_{1}}{V_{2}}=\frac{N_{1}}{N_{2}}=\frac{I_{2}}{I_{1}}$
$\Rightarrow \frac{I_{2}}{I_{1}}=\frac{4 N_{2}}{N_{2}}=4$
$\Rightarrow I_{2}=4 I_{1}$
