The instrument which works on the principle of mutual inductance is

The ratio of secondary to primary turns in a transformer is $3 : 2$. If the power output is $P$,then the input power,neglecting all losses,must be equal to:

In a step-up transformer, the turn ratio is $1 : 2$. A Leclanche cell $(e.m.f. = 1.5 \, V)$ is connected across the primary. The voltage developed in the secondary would be ......... $V$.

$A$ transformer works on

Voltage in the secondary coil of a transformer does not depend upon.

Write the working procedure of a transformer.