Why is the total of inductive losses, capacitive losses and resistive losses higher in AC current underwater cables compared to DC?

Question

Why is the total of inductive losses, capacitive losses and resistive losses higher in AC cables underwater compared to DC cables?

Thanks so much!

In: Physics

Answer 1

DC current doesn’t have inductive or capacitive losses. Both of these losses come from changing the voltage of the line, something that DC by definition does not do. DC is one fixed voltage on the wire at all times, so no energy is spent raising and lowering that voltage over and over like in AC.