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Article #71Re: Using mobile phone as an internet radio
From: Phil Hobbs
Date: Fri, 05 Oct 2012 16:19
Date: Fri, 05 Oct 2012 16:19
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On 10/05/2012 06:20 AM, Roderick Stewart wrote: > In article<de99517e-e5e1-4f9d-91e0- > 412ab3171a05@o8g2000yqm.googlegroups.com>, George Herold wrote: >> And thatοΏ½s it. Repeated on and off means that the thin region has a >> higher average temperature than the thick part of the filament. It >> evaporates faster and fails sooner. > > Won't a thin region of a lamp filament have a higher temperature than > the rest of it all the time, not just when the lamp is turning on? > > Rod. > -- > Thin spots will evaporate faster at all times, sure. The main question as to whether George's mechanism explains the alleged effect is whether, in a newish bulb, the inrush makes the hotspots exceed 2800K or whatever the normal filament temperature is, before the the inrush current subsides. I'd expect that to be more of a threshold effect, because the resistance of the filament ought to be pretty linear with temperature, whereas the evaporation essentially turns on at around 2500K, so the hot spots would have to be pretty thin already for it to do much. But as I say, I'm far from being a tungsten bulb expert myself. Cheers Phil Hobbs
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Date: Fri, 05 Oct 2012 12:19:01 -0400
From: Phil Hobbs <pcdhSpamMeSenseless@electrooptical.net>
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Subject: Re: Using mobile phone as an internet radio
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