Question

The ratio of primary voltage to secondary voltage in a transformer is ‘n’. The ratio of the primary current to secondary current in the transformer is :

• A. n
• B. 1/n
• C. $n^2$
• D. $1/n^2$

Answer 1

The correct option is B 1/n

The transformer turns ratio is given by ,

$\frac{N_P}{N_S}=\frac{V_P}{V_S}=n$

and also $\frac{N_P}{N_S}=\frac{I_S}{I_P}$

Thus, $\frac{I_S}{I_P}=\frac{V_P}{V_S}=n$

$\therefore \frac{I_P}{I_S}=\frac{1}{n}$