In FEMM the windings can be represented by explicit wires (each wire drawn separately, each representing single turn) or as a bulk (with number of turns N specified for the whole block).

Windings can be represented by a number of turns

There a number of ways in which the losses in the windings can be calculated or extracted. This paper shows that FEMM returns correct loss values for both types of windings: explicit wires or bulk windings, and the meaning of the integrals as well as the values of Real Power given in the Circuit Properties.