Flow of energy in D-C machines

The flow of electromagnetic energy is traced in a typical, somewhat idealized, d-c generator, using an adaptation of Poynting's vector, after a discussion justifying this procedure. Quantitative analysis of the flow within the conductors and in the gap is carried out following the specification of the electromagnetic fields. Qualitative analysis of the flow in intermediate regions and to machine output leads is presented. Extension to other types of machines and to less idealized situations is discussed.