There are two internal sources for heat in a transformer with only the primary connected. They are the actual resistance of the wire coils that form a complete circuit. (no way to avoid that ever) and the second is un resolved Eddy Currents in the laminations and mounting components. These are parasitic voltages created in the iron (or ferrite) of the core and brackets. Really good engineering and manufacturing can limit these but not entirely remove them. Every eddy current is an example of induction heating. Every eddy current also acts as a mini transformer that is shorted in the secondary. This produces in effect an inductive load on the primary, causing incremental phase lag. (probably not measurable without radical lab grade equipment) So the villan is actual resistance in the winding, but remember in these cold days it is adding to your house heat, and not much of that. Jim
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Today's Featured Article - The David Brown Rose Badge - by Samuel Kennedy. In the 13th century civil war was raging in England. Two English noblemen were involved in a conflict which became known as the War of the Roses. The Duke of York had as his emblem a white rose and the Earl of Lancaster had a red rose. Today the white rose is the official emblem of the county of Yorkshire and the red rose has been adopted by the neighboring county of Lancashire.
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