cable losses per meter (voltage > 400 and frequencies [50 Hz ... 60 Hz])
Dielectric loss is an AC concept. It sounds like you are dealing with RF current, which is bound by much more complicated laws than DC.

Ohm's law only tells a very small part of the story once you get to frequencies where dielectric loss is an issue. Cable resistance loss and dielectric loss are two totally separate things.

Also, above a few KHz, the resistance of a cable changes because the skin effect makes the current only use the outside and not the middle of the conductor.