The alternating voltage induced in the secondary coil of a transformer is mainly due to

The quantity that remains unchanged in the output with respect to the input in an ideal transformer is . . . . . . .

$A$ power transformer is used to step up an alternating $e.m.f.$ of $220\,V$ to $11\,kV$ to transmit $4.4\,kW$ of power. If the primary coil has $1000$ turns,what is the current rating of the secondary (in $,A$)? Assume $100\%$ efficiency for the transformer.

The number of turns in the primary and secondary coils of a transformer are $50$ and $200$ respectively. If the current in the primary coil is $4 \,A$, then the current in the secondary coil is: (in $\,A$)

How does a transformer affect the voltage and current?

$A$ transformer works on