Question

Transformers are simply a pair of coils like those we see in this experiment. They’re used to transform a source voltage to a different more desirable voltage. Real transformers usually have an iron core inside them that focuses the magnetic field in order to increase the magnetic flux passing through the secondary. What advantages would be provided by the iron core and the increased flux?

Answer 1

The Iron core is used in a transformer to facilitate low reluctance path for the flux linkage between primary & secondary windings. The reluctance in the magnetic circuit is analogous to resistance in an electric circuit which resists the generation of flux in the windings. Without the iron core or with air as a core, the flux linkage will be poor & hence the output of the transformer will be reduced. Iron core also possesses low retentivity & coercivity thereby reducing the hysteresis losses.