Editing Network analysis (electrical circuits) (section)

===Vector circuit theory===
{{see also|Spintronics}}

Generalization of circuit theory based on scalar quantities to vectorial currents is a necessity for newly evolving circuits such as spin circuits.{{clarify|date=November 2018}}  Generalized circuit variables consist of four components: scalar current and vector spin current in x, y, and z directions. The voltages and currents each become vector quantities with conductance described as a 4x4 spin conductance matrix.{{Citation needed|reason=Ref needed to show this is a mainstream, or accepted, idea beyond the proposing paper|date=November 2018}}