$A$ $220 V$ input is supplied to a transformer. The output circuit draws a current of $2.0 A$ at $440 V$. If the ratio of output to input power is $0.8$,then the current drawn by the primary winding is: (in $A$)

The output voltage of a transformer connected to a $220 \, V$ line is $1100 \, V$ at a $1 \, A$ current. Its efficiency is $100 \%$. The current coming from the line is ........ $A$.

$A$ transformer has $120$ turns in the primary coil and carries $5 \text{ A}$ current. Input power is $1 \text{ kW}$. To have $560 \text{ V}$ output, the number of turns in the secondary coil will be:

The output voltage of an ideal transformer,connected to a $240 \, V$ $a.c.$ mains,is $24 \, V$. When this transformer is used to light a bulb with rating $(24 \, V, 24 \, W)$,calculate the current in the primary coil of the circuit.

$A$ step-down transformer is connected to a $2400 \, V$ line, and $80 \, A$ of current is found to flow in the output load. The ratio of the turns in the primary and secondary coil is $20 : 1$. If the transformer efficiency is $100\%$, then the current flowing in the primary coil will be: (in $A$)

The transformation ratio in a step-up transformer is