An ideal transformer has a turns ratio of $10$. When the primary is connected to $220 \ V$,$50 \ Hz$ as a source,the power output is

An ideal transformer has $500$ and $5000$ turns in primary and secondary windings respectively. If the primary coil is connected to a $6\, V$ battery, then the secondary voltage is....$V$

The primary coil of a transformer is connected to a $220 \,V$ $AC$ source. The number of turns in the primary and secondary coils are $100$ and $10$ respectively. The secondary coil is connected to two resistors in series as shown in the figure. The output voltage $\left(V_0\right)$ is: (in $\,V$)

$A$ step-down transformer transforms $220 \text{ V}$ to $11 \text{ V}$. If the currents in the primary and secondary coils are $5 \text{ A}$ and $90 \text{ A}$ respectively,the efficiency of the transformer is: (in $\%$)

Large transformers,when used for some time,become hot and are cooled by circulating oil. The heating of a transformer is due to:

$A$ transformer has $100$ turns in the primary coil and carries $8$ $A$ current. If input power is $1$ $kW$, the number of turns in the secondary coil to have $500$ $V$ output will be