For many purposes, it is necessary to change an alternating voltage from one value to another. This is done with a transformer.
The basic principle behind a transformer is

For many purposes, it is necessary to change an alternating voltage from one value to another. This is done with a transformer. Give an expression for the voltage and current in a transformer.

What is the basic principle of working of a transformer ?

A transformer is used to change the alternating voltage to a high or low value. A power transmission line feeds input power of 2300 V to a stepdown transformer with its primary windings having 4000 turns. What should be the number of turns in the secondary in order to get output power at 230 V?

Refraction of light is the phenomenon of change in the path of light ray when it goes from one medium to another. State the laws of refraction

Dimension method helps in converting the units from one system into another. Name the principle used for the above purpose.

Refraction of light is the phenomenon of change in the path of light ray when it goes from one medium to another.The radius of curvature of each face of a convex lens made of glass of refractive index 1.5 is 30 cm. Calculate the focal length of the lens in air.

The law of conversation of energy States that energy can neither be created nor be destroyed but can only change from one form into another. A bus and a car moving with the same kinetic energy are brought to rest by applying an equal ratardation force by the braking systems. Which one will come to rest at a shorter distance. Give the reason behind your answer.