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Subject: Re: [M]: Lightbox drawings and details
From: R. A. Greiner
Reply To: mapug@shore.net
Date: Thu Feb 22 17:56:07 2001
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While you're here, how about checking out the
Astronomy Book
List ? |
>
> Hi Assaf,
>
> Nope. It doesn't work that way. :-) Any resistors, light bulbs, etc. hooked
> in series, all have the same amount of current flowing through them, no
> matter how 'far' fro the power source they may be. (Ohms Law). And if all of
> the objects have the same resistance... the bulbs would... then all of them
> will have the same voltage drop across them and will use the same power.
> (Also Ohms Law, or Kirchoffs Law if you prefer.)
>
> Anyway, there is no relationship at all between how far from the power source
> an object is and what amount of power it will dissipate. Perhaps you have
> them mounted in some way where the bulbs that just happen to be nearest the
> battery, aren't as obstructed or something like that? Just a thought.
>
> Bruce Johnston
>
The above explanation is exactly correct. I will not comment on the
strange theory set out elsewhere. :-)
The current through each is identical. But never-the-less these small
bulbs will generally be of slightly different brightnesses because
they are of different resistance. The quality control of the
resistance in tiny bulbs is very poor. To get the bulbs to be of
similar brightness, you will need to get some extra bulbs and keep
replacing bulbs until you get a matched set. You may find that you
have to try again as many bulbs to get a closely matched set.
Doc G
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