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phycics question - Page 2

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Posted by Morris Dovey on December 27, 2011, 5:48 pm
 
On 12/27/11 10:32 AM, zura_slambergurlz@yahoo.com wrote:


Two possible reasons: (1) flashlights that have more input power should
be able to produce more output and (2) some light sources (LED /
incandescent / arc) convert electrical power to light more efficiently
than others.


When the batteries are in-line and point in the same direction produce a
voltage that is the sum of the voltages of each battery. Higher voltage
(with the same current) produces more input power. Reversing one of the
batteries screws this up.


Age. :-)


Usually it's because an internal connection is worsened (dimmer) or
improved (brighter).

HTH

--
Morris Dovey
DeSoto Solar
http://www.iedu.com/Solar/

Posted by Mho on December 31, 2011, 3:57 am
 
The batteries always produce the sum of their voltages. [evil grin]

-------------

When the batteries are in-line and point in the same direction produce a
voltage that is the sum of the voltages of each battery. Higher voltage
(with the same current) produces more input power. Reversing one of the
batteries screws this up.


Posted by Malcom \"Mal\" Reynolds on December 27, 2011, 10:48 pm
  zura_slambergurlz@yahoo.com wrote:


any sufficiently advanced technology is indistinguishable from magic

Posted by Gordon on December 27, 2011, 11:05 pm
 zura_slambergurlz@yahoo.com wrote in news:94e4c697-f479-4648-b91f-
346af6c13e31@b14g2000prn.googlegroups.com:


I've got more important things to think about.
But, here goes.


Just like household light bulbs, flashlight bulbs have
a rating that indicates their brightness. With house
hold bulbs its generally the wattage rating, although
we are beginning to wise up and use the lumins rating.
With flashlight bulbs its the bulb type (CR-??).  When
you buy a flashlight bulb, you can ask for a brighter
or dimmer bulb. The above discusion doesn't apply to LEDs.


Really??


Depletion of the chemical reactants.
 

A poor contact somewhere in the flashlight. Shaking
it will restore the contact.  But it can also make it
dim too.

Posted by Mho on December 31, 2011, 3:59 am
 How does a PR-2 bulb indicate it is brighter or dimmer than a PR-3 unit?


"Gordon"  wrote in message

Just like household light bulbs, flashlight bulbs have
a rating that indicates their brightness. With house
hold bulbs its generally the wattage rating, although
we are beginning to wise up and use the lumins rating.
With flashlight bulbs its the bulb type (CR-??).  When
you buy a flashlight bulb, you can ask for a brighter
or dimmer bulb. The above discusion doesn't apply to LEDs.


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