List of top Physics Questions on Transformers

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.

A step up transformer has turn ratio \(10:1\). A cell of emf \(2\,V\) is fed to the primary, then the secondary voltage developed is:

The alternating e.m.f. induced in the secondary coil of a transformer is mainly due to

An observer looks at a tree of height 15 m with a telescope of magnifying power 10. To him the tree appears

The ratio of secondary and primary turns of step-up transformer is 4 : 1. If a current of 4 A is applied to the primary, the induced current in secondary will be

In a step-up transformer the turn ratio is 1:2. A Leclanché cell (emf 1.5 V) is connected across the primary. The voltage across the secondary is:

The number of turns in primary coil of a transformer is 20 and the number of turns in the secondary is 10. If the voltage across the primary is 220 V, what is the voltage across the secondary?

The ore that is concentrated by froth floatation process is

A step-up transformer operates on a 230 V line and supplies a load of 2 A. The ratio of primary to secondary windings is 1:25. The current in the primary is: