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[Amps] PS Theory ?

To: Amps@contesting.com
Subject: [Amps] PS Theory ?
From: "Mike, K8LH" <k8lh@kramerairtool.com>
Date: Wed, 27 Aug 2003 06:23:40 -0400
List-post: <mailto:amps@contesting.com>
Please excuse the dumb question...  I'm trying to figure out how to
determine the power handling capability of transformers (I did take a
quick look through the ARRL Handbook last night)...

Questions: 

How can you determine the power handling capability of a transformer???

For example, the secondary on the transformer in my Heath SB-201 is
rated at 800 VAC at 0.5 amps...  I would think this transformer would
only be good for about 400 watts of power (800 x 0.5) but it seems that
if you feed this secondary into a full-wave bridge rectifier and
capacitors you would get about 1,000 volts and 0.5 amps under load (500
watts), or feed it into a voltage doubler circuit, like that in the
SB-201, and you get about 2,000 vdc at 0.5 amps under load (1,000
watts)...

I'm confused...  What am I missing???  Thanks...
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