Re: 4.5amp Variac good enough?

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "by way of Terry Fritz <twftesla-at-uswest-dot-net>" <Fucian-at-aol-dot-com>

In a message dated 2/25/01 11:43:27 PM Eastern Standard Time, 
tesla-at-pupman-dot-com writes: 


>
> Hi Matt, 
>
> A 12000volt 30mA transformer can be rated in "VoltAmps" or "VA" which is the 
> measure used for such things.  You simply multiply the voltage and current. 
>  so 
> your transformer is: 
>
> 12000 x 0.030 = 360 VA 
>
> Your variac is the same idea so: 
>
> 120 x 4.5 = 540 VA 
>
> So the variac has plenty of room to spare.  You will want about 90uF for a 
> PFC 
> cap.  However, from the chart below, your tranny would run about 550 VA 
> without 
> a PFC cap so you would still be close to fine. 
>
> http://hot-streamer-dot-com/TeslaCoils/Misc/NSTStudy/12-30.gif 
>
> You may note that variacs can be run at higher than recomended power too 
> for a 
> short time as shown in figure "F" below.  A little fan helps a bunch too. 
>
> http://hot-streamer-dot-com/TeslaCoils/Misc/VarBack.jpg 
>
> However, it is always best to run things within their ratings if you can... 
>
> Cheers, 
>
>        Terry 
>



So i could use my 4.5 amp variac just plain w/o a PFC? 

Very GOOD!!!!!! 

matt