whats the use of core in transformer?

Question

whats the difference in flux linkage in iron core and air core transformer

Answer 1

The atoms of iron line up with the magnetic field produced by the changing voltage. This prevents the magnetic field (and thus, electric field) from decresing so quickly This effect greatly increases the efficiency of the transformer.

Answer 2

The purpose of an iron core is to improve inductance from one coil to the other. As the frequency increases, the layers or laminations of the core must be made smaller and thinner to prevent losses due to eddy currents. Eventually, we must use fine particles of iron and have hollow iron-dust filled cores, or ceramic/metal composites (cermets) such as ferrites, which contain finely divided iron particles in a suspension in a ceramic base material. At even higher frequencies, the losses become too much and we must use an air core. So, generally speaking, at low frequencies, we must use iron cores, at mid frequencies we must use powdered iron or ferrites, and at high frequencies, we must use air core.

Answer 3

the iron core keeps the magnetic fields concentrated within the transformer because iron is a better "conductor" of magnetic lines of force than air. better transfer of energy

Answer 4

It is used as core.

Answer 5

to provide return path for flux