Pretty much - except there is no secondary. It is a big tapped choke
rather than a transformer. The turns ratio still applies to get the
output voltage, though. Picture the way a volume control works, and
substitute an inductor for the resistor and you have it.

Thanks, Don. Two questions:
- Is this how a transformer volume control works - is it a variac or an
isolation transformer?
- How come my variac goes up to 270v - the analogy is the famous volume control
that goes up to 11!

=== Andy Evans ===
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