Mattax said

I'm having trouble understanding what the issue is.
This
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Line Voltage is another way of saying system voltage.
The system voltage at the input side of the regulator determines how much current flows through. It switches on or off or through a resistor - sometimes very rapidly.

The current creates an electromagnetic field. Field is shorthand for electromagnetic field.
if you're not famialir with making an electromagnetic with copper wire, look it up, its fun.

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