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Re: Variac current and VA rating

Original poster: "BunnyKiller by way of Terry Fritz <twftesla-at-qwest-dot-net>" <bigfoo39-at-telocity-dot-com>

Tesla list wrote:

> Original poster: "Pete Komen by way of Terry Fritz <twftesla-at-qwest-dot-net>"
> I have an old variac rated at 9 amps with taps for 120vac and 240vac input.
> I have read that the output current of a variac autotransformer is 180
> degrees out of phase with the input current and therefore tend to cancel
> each other out.  Is it possible to set the output for 120vac and draw 18
> amps when the input is 240vac at 9 amps without overloading any of the
> windings?


Hi Pete...

not to knowledgeable on the phase item but as far as the amp rating on the
variacs ...  the wire
and wiper carbon set the scene for as how much the variac can handle. If it
is rated for 9 amps
then 9 amps it is at just about any "input" voltage.

Scot D