I have another question for the group. Take any transformer, in this case, I'll use a torus shaped core; one with the primary spiraling around the core all the way (360 deg.). As I understand, the torus design is efficient and there is low flux leakage from the core. If this is the case, how is the magnetic flux cutting through the secondary (and the primary) to produce current? It seems that flux only has to pass through the inner area of the coiled wire to generate current without actually cutting across the wire itself yet transformers are obviously efficient devices. Does this have to do with flux actually collapsing and expanding out of and into the core due to the AC? The problem I see with the toroid design, the flux is always kept in the core because the windings are looped back on itself due to the torus shape.
Thanks, John