Path: utzoo!utgpu!news-server.csri.toronto.edu!rutgers!sun-barr!newstop!exodus!bike2work.Eng.Sun.COM!bm
From: bm@bike2work.Eng.Sun.COM (Bill(Francis) Michel)
Newsgroups: sci.electronics
Subject: Transformer current ratings
Message-ID: <8927@exodus.Eng.Sun.COM>
Date: 1 Mar 91 20:34:52 GMT
Sender: news@exodus.Eng.Sun.COM
Reply-To: bm@bike2work.Eng.Sun.COM (Bill(Francis) Michel)
Organization: Sun Microsystems, Inc.  Mt. View, Ca.
Lines: 18

I want to build a power supply for a halogen lamp that uses 55 watts. This
is a 12v lamp. THis means somewhere around 4 amps, right? But when I go
to buy a transformer, the ratings they give (in amps) apply to a certain
number of amps, but I'm not sure whether that means through the primary 
or secondary windings?

Can someone clear me up on this?

If it's through the primary, how do I calculate the needs of my system,
given what I know about the secondary circuit.


Thanks

Bill
--
Bill Michel			
bm@eng.sun.com		These views are my own, not Sun's.