"DoN. Nichols" writes:

Some are ferrite iron power imbedded in the donut, but trust me,
it's got something magnetic....

And the ferrite iron is for high frequencies -- perhaps a DC-DC
switching mode converter, not for low frequencies like 60 Hz or 50 Hz.
Not even for aircraft 400 Hz.

Did not mean to imply it was; just pointing out that toroids use
magnetics just as old fashioned transformers do....they ain't
magic.
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