List of top Physics Questions on Transformers

In a step-up transformer, the value of current in secondary coil compared to the primary coil is
A transformer is a device used for converting:
What is the need for laminating the core of a transformer?
A transformer which steps down 330 V to 33 V is to operate a device having impedance 110 $\Omega$. The current drawn by the primary coil of the transformer is:

A transformer of 100% efficiency has 200 turns in the primary and 40000 turns in the secondary. It is connected to a 220 V main supply and secondary feeds to a 100 K$\Omega$ resistance. The potential difference per turn is

The number of windings in the primary and secondary of a transformer are 100 and 2000 respectively. If 50 V a.c is applied to the primary, the potential difference across the secondary is
The current drawn by the primary coil of an ideal transformer, which steps up 22 V into 220 V, to operate a device having a load resistance of 110 \(\Omega\) is:
An ideal transfomer has a turns ratio of 10. When the primary is connected to 220V,50Hz ac source, the power output is
An ideal transformer with purely resistive load operates at 12 kV on the primary side. It supplies electrical energy to a number of nearby houses at 120 V. The average rate of energy consumption in the houses served by the transformer is 60 kW. The value of resistive load (Rs) required in the secondary circuit will be ________ mΩ.
The core used in a transformer is laminated in order to
The output of a step down transformer is measured to be $48\, V$ when connected to a ${12 \, W}$ bulb. The value of peak current is
A primary coil and secondary coil are placed close to each other. A current, which changes at the rate of 25 A in a millisecond, is present in the primary coil. If the mutual inductance is $92 \times 10^{-6} H$, then the value of induced emf in the secondary coil is
Which quantity is increased in step-down transformer?
A transformer cannot work on $DC$ supply. $DC$ changes neither in magnitude nor in direction.
The core of any transformer is laminated so as to
A transformer of 100% efficiency has 200rums in the primary and 40000 turns in secondary. It is connected to a 220 V main supply and secondary feeds to a 100 $ K\Omega $ resistance. The potential difference per turn is
If the coefficient of mutual induction of the primary and secondary coils of an induction coil is $5\, H$ and a current of $10 A$ is cut-off in $5 \times 10^{-4} s$, the emf inducted (in volt) in the secondary coil is :
Core of a transformer is made up of:
Transformer is based upon the principle of:
The core of a transformer is laminated to reduce
The current drawn by the primary of a transformer, which steps down $200\,V$ to $20\,V$ to operate a device of resistance $20\,\Omega $. is (Assume the efficiency of the transformer to be $80\, \%$)
Transformer is used to
The coupling coefficient of the perfectly coupled coils is :
Rectifier converts:
Quantity that remains unchanged in a transformer is