Radio frequency heating is composed of generator and applicator. The applicator is where the materials are being heated and the generator produces alternating charges to the two opposite electrodes of the applicator (hot and ground).
Roland,
Well, let's see. It all depends on the material being heated. If it's a metal, then the currents are entirely contained in the skin depth - and this can be quite shallow and so lead to high current densities and thus high heating rates. What sort of items are you seeking to heat?
There are three ways at least that RF heating can work. One, as James says is resistive losses due to eddy current generation in the load; the second is magnetic hysteresis losses due to domain reversals in the load and thirdly are electrostatic hysteresis losses. Which one applies - or dominates - is exactly as James says, dependent on the material.
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