"Richard J Kinch" wrote in message
.. .
writes:

He then asked about what if the transformer was loaded to its maximum.
This is the part I was unsure of, but going back to my memories of AC
circuit analysis I told him that I thought that the VA losses remained
the same for the core and copper losses since the input to the primary
does not change.

Of course it changes. More output current draws more input current.

Actually, core losses don't change much until the core undergoes saturation,
then they go sky high.

But copper loss increases more or less directly with current, but
exacerbated by temperature rise.

LLoyd