Re: [CAD_CAM_EDM_DRO] Transformer question

In a message dated 12-Jan-01 07:33:25 Central Standard Time,
jvicars@... writes:

> Do transformers work on a ratio of input to output, or are they strictly for
> the rated voltages? In other words if I have a 240 to 120 step down and I
> put 120 on the primaries will I get 60 V on the secondaries? What are the
> practical limits to doing what I described? Thanks
>

Yes. However, you could NOT expect to get the full POWER through a
transformer possible when using "rated voltage", as the CURRENT must be kept
lower, too, as the current-handling is a function of wire-cross-section (how
"fat" the copper is).

Also, you can NOT try to put 240 V. into a winding rated for 120 V!!! That
might work for five seconds- yes, you would expect to get twice the
secondary voltage normal, but the NUMBER OF TURNS had been calculated for the
design-voltage, so, doubling it would over-burden the primary, even if NO
load, and it would likewise cook things, very-probably with undue danger to
buildings, lungs, children, pets, and other living things!

See my article: <A HREF="http://members.tripod.com/~schematics/xform/xformer1.htm">Roll Your Own Power-Transformers!</A>

Watch it! Jan Rowland, Troll


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