Energy Transport in Conductors: A Field-Based View of EMI in Avionics Wiring

Expository technical note (not peer reviewed). Using the Drude model, surface-charge boundary conditions and the Poynting vector, it shows that energy propagates through the electromagnetic fields surrounding a conductor rather than through the charge carriers, and applies this view to electromagnetic interference (EMI) in avionics wiring: twisted pairs and coaxial shielding as geometric tools that confine the field volume to prevent crosstalk.