(iv) Hysteresis: The magnetisation of the core is repeatedly reversed by
the alternating magnetic field The resulting expenditure of energy in
the core appears as heat and is kept to a minimum by using a magnetic
material which has a low hysteresis loss The large scale transmission and distribution of electrical energy over
long distances is done with the use of transformers The voltage output
of the generator is stepped-up (so that current is reduced and
consequently, the I 2R loss is cut down)