On Thu, 08 Dec 2005 14:43:11 GMT, JS
wrote:

On Thu 08 Dec 2005 06:00:12, Franc Zabkar
wrote:

The magnetic field produced by any number of turns of mains flex is
zero. Think about it.

Hmmm. Yes. :-)

I was hoping to use a compass deflection as a way of telling how much
heat/power was being lost in neatly wrapped coiled of mains flex.

Even if you had a net magnetic field, it would be an AC
field, and your compass would not respond to that. Also,
there is no direct correlation between the strength of the
magnetic field and the power loss. You need to include a
number of other factors.

Surely there is a loss of something due to the neatness - or perhaps
not?

Why should neatness lead to loss? In the days before all
electronic devices used printed circuits, with systems were
connected with point-to-point wiring, high frequency
electronic systems had much neater wiring than low frequency
equipment, since it lead to shorter lengths of wire and
lower capacitance between wires.

--
Vic Roberts
http://www.RobertsResearchInc.com
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