On Thu, 18 May 2000 14:51:59 +1200 Lance Allen <l.allen@AUCKLAND.AC.NZ>
writes:
> rad0 wrote
> > When you make a transformer, do you have to
> > use insulated wire??  I was looking at a transformer
> > the other day and it seemed to look like 'bare' copper
> > wire.  Is it insulated with some sort of clear spray, or
> > is it really bare copper wire.
> >
> > I want to make an electro-magnet.
> >
> > Thanks in advance.
>
> Yes
> The wire must be insulated, the wire you saw would
> probably have some sort of clear enamel on it.
>
> Uninsulated wire will simply short out the turns, resulting
> in excess current and no significant flux being generated
> in the core.
>
>


        I heard that Morse's first telegraph was built with uninsulated wire in
the electromagnet. Didn't work. Someone advised him to use insulated
wire.

Harold

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