Original poster: Terry Fritz <vardin@xxxxxxxxxxxxxxxxxxxxxxx> Hi,The variac acts like a pure voltage source. It is not current limited (except for a fuse). Thus, it will put out as much power as you want up to the point where it actually burns up.
In general, if it puts 4 amps into a circuit at 120VAC it will put 4.666 amps into a circuit at 140VAC. The power in the first case is 120 x 4 = 480 watts and 140 x 4.666 = 653 watts in the second case.
If an NST puts out 12000 volts at 120 VAC, it will put out 14000 volts at 140 VAC in.
Cheers,
Terry
At 05:57 PM 11/26/2005, you wrote:
but, my variac outputs, or will only take, 4 amps of current, at 120VAC. So wont hiring out voltage to 140 VAC, output only 3.33 amps? The power throughout will still be exactly equal...........From: "Tesla list" <tesla@xxxxxxxxxx> To: tesla@xxxxxxxxxx Subject: Re: SIZE of RF chokes? Date: Sat, 26 Nov 2005 17:00:11 -0700 Original poster: "Gerry Reynolds" <gerryreynolds@xxxxxxxxxxxxx> Hi Gary,I agree, if you leave your safety gap setting based on 120Vac then no more voltage (I take full advantage of 140Vac and set the safety gap based on 140V - others may not). 140Vac may run the NST closer to saturation and thus the current could be higher but not the voltage if the safety gap is set at 120Vac. I have never heard of an NST failure due to current only voltage.Gerry R.Original poster: "Lau, Gary" <Gary.Lau@xxxxxx> Although intuition suggests that running an NST at 140VAC is more stressful than at 120VAC, I can't think of an actual reason why.