<VV> Why Re: Bulbs burn out quickly?

[FrankCB at aol.com]

Matt and Frank,
    You're BOTH correct.  <GGG> The  resistance of the filament in the bulb 
is not constant, but is LOWEST at ambient  temp. and increases as the bulb 
warms up.  So even with a constant  feed voltage, the inrush of current into a 
cold bulb is greater than through the  same bulb after it heats up to 
incandescence temp.  That's why these bulbs,  whether in cars or in homes, tend to burn 
out when first turned on rather than  after they've been on for a time.
    Frank "sees both sides" Burkhard
 
In a message dated 5/11/2008 3:54:06 PM Eastern Daylight Time,  
patiomatt at aol.com writes:

Frank, I  explained the problem...INRUSH..... the filament cannot handle 
it.......  45 years of many experiences with this problem..MAY NOT be 
THE PROBLEM  this time....but COULD BE



Matt Nall
Webspace:  http://members.aol.com/patiomatt


-----Original  Message-----
From: Frank DuVal <corvairduval at cox.net>
No, Ron is  right. The current through a bulb is determined by the
available volatge  and the resistance of the bulb. E=IR, I=E/R ohm's 
law.
The only way to  get more current through the bulb is to apply more
voltage. Even if you put  the bulb in series with the starter motor, the
current through the bulb  would not exceed its normal current. Of course
the starter motor would not  run, since now its current is limited.

Frank  DuVal







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