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 - Fire in the Field A hay fire is no laughing matter-well, maybe one was! And a good life-lesson, too. Following World War II many farm boys returned home both older and wiser. One such man was my employer the summer I was sixteen. He was a farmer by birth and a farmer by choice, and like many returning soldiers, he was our silent hero: without medals or decorations, but with a certain ability to survive. It was on his farm that I learned to use the combination hand clutch and brake on a John D
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