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 Fordson F Ignition System - by Anthony West. A fellow restorer contacted me earlier this year asking for some help and advice on a model F that he was restoring. He had over a period of months spent a fair amount of his hard earned cash on replacement parts for the old "trembler" ignition. Sadly though all his efforts seemed to be a waste of time and money as he still couldn''t get the temperamental old thing to run correctly!! If i said that this was a little frustrating for him that would be "conservative" in fact the problem had reduce
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