electro-Physics: 17.3409 volts

From: Paul Koning <pkoning_at_equallogic.com>
Date: Mon Dec 13 16:57:40 2004

>>>>> "Carlos" == Carlos Murillo <cmurillo_at_manizales.autonoma.edu.co> writes:

>> It isn't much good for home use. In fact, lamps don't do as well
>> on DC as AC because of the electrical effects of the wire
>> evaporating ( not sure which end goes first ).

 Carlos> Ah, the "Edison Effect". Some electrons (especially those
 Carlos> closer to the negative side) would jump away from the
 Carlos> filament and then, thanks to the electric field, land on the
 Carlos> filament but closer to the anode. The result was that the
 Carlos> section of the filament closer to the anode would be carrying
 Carlos> more current than say, the first third of the length of the
 Carlos> filament (in the - towards + direction). So filament
 Carlos> failures almost always occured in the last 1/3 of the
 Carlos> filament. ...

Interesting! That suggests that DC should be no big problem for
halogen lamps (incandescents with iodine vapor fill).

        paul
Received on Mon Dec 13 2004 - 16:57:40 GMT