[R-390] Another (perhaps) silly ballast question

[Tim Shoppa]

"Barry" <n4buq at aol.com> wrote:
>  If the secondary was capable of 1A when the primary is
> connected to 120V, does the current rating go down as
> the primary voltage is decreased?

No. The current rating may indeed go up to some small
extent (but don't count on it) because of less core heating.
(I-squared-R heating of the secondary winding will remain
the same of course at constant amps).

Older ARRL handbooks had a good section on cannibalizing/
modifying/operating on different voltages of AC transformers,
with lots of good seat-of-the-pants estimates as to wire heating
vs current and wire size.

Tim.