Re: [ATM] ATM: What do they offer:

[Jarvis Krumbein <jkoptic@juno.com>]

The increased resistance is due to the temperature coefficient of the
material, usually tungsten.  The inductance of such a physically small
coil is insignificant.

Richard, I have seen an oscillator of this type many many years ago.  It
will only work if there is a large thermal mass to the filaments and it's
hard to get it started but once going it's quite stable.

Jarvis Krumbein

On Sat, 18 Jun 2005 19:51:12 -0700 Bruce MacDonald <brumac@gmail.com>
writes:
> That might explain why incandescent filaments typically fail the
> instant you flick the switch.
> 
> Is the increased resistance due to the fact that filaments are
> typically coils, and hence inductors, or is it a thermal property?
> 
> I'm not sure why you would expect lamps in series to glow w/ 
> different
> intensities.
> If the filaments are identical, once equilibrium is reached, they 
> will
> all be the same, no?
> 
> BM
> 
> On 6/18/05, Richard Schwartz <richas@earthlink.net> wrote:
> > At last night's meeting, one of the attendees mentioned that 
> incandescent
> > lights have a cold starting resistance that is only 1/10 the 
> resistance they
> > have at full brightness.   If this is so, why is it that two 
> identical lamps
> > in series glow with approximately equal brightness?   Why can't we 
> make
> > thermo-optical flip-flops that use this principle?
> > 
> > . . . Richard
> >
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