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
AC turns the flow of electricity around and again and again … the magnetic field induced around the cable needs to dissolve and turn around with that (the round magnetic lines need to go the other way around when the flow turns). A changing magnetic field however induces an electric current in the cable, which is always counter to the current we want to have in the new state. That is one source. In undersea or overland cables with moist weather around, the very slightly magnetic water molecules around the cable are also turned according to the mag fields and the change in it. This obviously needs energy which is siphoned from the mag field change i.e. your current again.
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