At 10:38 AM 3/16/2006 -0500, you wrote:
Ode Coyote wrote:
> Resistance type bulbs will run on DC just fine..and last longer as DC
> eliminates filament wiggle from rapid heating and cooling while AC changes
> phases.
> [Put on a pair of dark sunglasses and watch an unfrosted light bulb to
> see it.]
>
> You'll need something like a 5 amp/ 200 volt rectifier bridge.
>
> Due to a steady state voltage, a 300 watt bulb might draw a few more watts
> and output a bit more light running on DC???
>
> Ode
You have to put a filter capacitor on it to get DC. With a full wave
bridge you
get pulsating DC, and the effect on the filiment will be no different than AC.
The reason is that the filament turns attract each other when current
flows, so
the filament tends to want to pull together during the highest current part of
the cycle. The direction of the current is irrelevent. But if you add a
big cap
to make it truely DC, then the vibration will disappear.
Marshall
Sure, rectifier ... and a cap.
Many filaments don't have coils to attract to each other and they still wiggle.
Expansion and contraction. [not that coils won't attract]
Ode
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