RE: [TCML] Transformer rating

["Dr.Hankenstein" <dr.hankenstein@xxxxxxxxxxxxx>]

IT is because the manufacturer's VA shouldn't be exceeded. For example,
if you had a 1:1 ratio 1000VA xfmr rated 100 volts at 10 amps, and you
decided to run it at 50 volts, you really would only have a total VA
capacity of 50V x 10A = 500VA max. and NOT 50V x 20A! The wire is not
rated for 20A. So the magic formula is T x A = T x A (Turns time amps
equals turns times amps) same for VA (V x A = V x A). Also voltage
rating should not be exceeded by more than 10 to 20% of name plate
rating.

Hope that helps,
Hank

-----Original Message-----
From: tesla-bounces@xxxxxxxxxx [mailto:tesla-bounces@xxxxxxxxxx] On
Behalf Of Nicholas Goble
Sent: Tuesday, May 19, 2009 9:47 AM
To: tesla@xxxxxxxxxx
Subject: [TCML] Transformer rating

I don't understand how what it means when a transformer is rated with
voltage AND amps.  For example, a 15kV/36mA NST or something smaller
like a
14V/1Amp wall adapter.  Is the transformer a voltage or current source?

I'm just thinking back to basic physics V=IR.  If the transformer
supplies
15kV and I have a load resistance of 1500ohms, why can't I draw 10Amps?

Nicholas Goble


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