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Article #243Re: Soldering irons: made in America but designed in Russia?
From: Phil Hobbs
Date: Fri, 24 Apr 2009 18:04
Date: Fri, 24 Apr 2009 18:04
19 lines
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2848 bytes
Andrew Gabriel wrote: > In article <fjlIl.34167$fe2.29061@newsfe06.ams2>, > "ian field" <gangprobing.alien@ntlworld.com> writes: > In countries with different mains voltage, the ratio may need > adjusting, as filament lamp efficiency varies with the design > voltage. (The most efficient voltage to design a 100W lamp is > about 55V, given a reasonable life requirement, and as you move > the design voltage away from 55V in either direction, the lamp > efficiency drops.) > Interesting. I can see it dropping due to conduction losses when the voltage gets too low (so that the wire gets too fat) but what's the mechanism for the drop-off at high voltages? Cheers, Phil Hobbs
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