[deelowe]

Right. Additionally, frequency plays a role and AC can ionize the air at higher voltages, which increase impedance super-linearly. Basically, high voltage DC is probably going to become a very attractive option as high voltage transistors become commonplace. The reason AC was so attractive previously was b/c it's very easy to convert voltage to current and vice versa with just some coils of wire. With silicon based solutions, that's becoming a much less efficient (and even cost more costly) option.