"micky"

Oil furance ignition transformer. Proper resistance for primary.

Is it possible that a winding with only 4 ohms DC resistance would
have 52 ohms impedance at 60 Hertz**?


** The primary impedance with no load is actually much higher than your
naive calculation.

Ohms law has nothing to do with it.

If you check similar size 120VAC transformers, you will find their primary
resistances are all around 3 ohms.

With 2 amps of current in the winding, the heat generated ( given by I
squared R) = 12watts.

Expect a similar amount of heat in the secondary and you can see why the
things get quite warm.


..... Phil