Define all the losses in the transformer with the diagram and then define the hysterisis loss with thw graph.

When the transformer is woking on the no-load condition, there are two components of the losses.

Core-loss component of the exciting current-

The core-loss is mainly done by the reactive element present in the transformer.

Copper-loss component of the exciting current:

The copper-loss is done by the resistive element present in the transformer.

The phasor-diagram is shown below for the no-load condition of the transformer.

Further, the core-loss is divided into two parts,

Eddy-current loss:

When an alternating current is supplied to the primary side of the transformer, the alternating current produces the alternating magnetizing flux in the core as this flux links with the secondary winding, an induced voltage originates in the secondary side that results in an alternating current in the secondary winding. But some of the alternating flux of the transformer also links with the other conducting parts like steel core or iron body of the transformer. Thus, an induced voltage also originates in these parts. Due to these electromotive forces, a current is also circuiting locally at these parts of the transformer. This circulating current will not contribute to the output of the transformer. This loss is known as Eddy-current loss