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 - Hydraulics - Cylinder Anatomy - by Curtis von Fange. Let�s make one more addition to our series on hydraulics. I�ve noticed a few questions in the comment section that could pertain to hydraulic cylinders so I thought we could take a short look at this real workhorse of the circuit. Cylinders are the reason for the hydraulic circuit. They take the fluid power delivered from the pump and magically change it into mechanical power. There are many types of cylinders that one might run across on a farm scenario. Each one could take a chapter in
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