Re: [Phys-l] three-way bulb

[Bernard Cleyet <bernardcleyet@redshift.com>]

At the moment CFLs (compact fluorescent lamps).  By replacing nearly all 
our incans w/ CFLs, we halved * our e bill (really!).  I suppose next 
will be LEDs.  Already most new cars use them (xcpt head lamps), and in 
the space of a week all the traffik signal incans turned into leds a 
coupala years ago here in podunk Salinas.

*  Algebra prob. for the kiddies:  What proportion of the electrical 
energy consumption is lighting if the total is halved by replacing the 
lamps with 1/3 power (3X lumens per W)?

Yeah, I had more time for disassembly in elem. school than any later time.

bc, tho retired still little disassembly time.

Anthony Lapinski wrote:

> Yes, parallel.
>
> Actually, I make a junk list every year (electronic devices, etc.), get
> many donations, and take many things apart. So in this sense, I AM an
> experimentalist. Have many broken bulbs, too. I just haven't had the time
> to take apart a three way bulb/socket or an electric blanket. Well,
> actually, I DID take apart an electric blanket years ago. I kept the
> elements but don't remember how they were actually wired.
>
> I assume incandescent bulbs will be replaced by LED's or halogen bulbs?
>
> Forum for Physics Educators <phys-l@carnot.physics.buffalo.edu> writes:
>  
>
> > "... or in series with each other"
> >
> > You mean parallel, don't you?  The one's I have (and no longer use) are
> > labeled 30, 70, 100; 50, 100, 150; 100, 200, 300 [mogul base], etc.
> >
> > AL, I suspect, is not an experimentalist; otherwise he'da taken one
> > apart.  Often one may carefully prise the base off w/o breaking the bulb
> > using a thin screwdriver or knife.  Better an old one using soldered (Cu
> > not Al) base.  Otherwise cut the screw connection and scrape away the
> > bottom of the base connections.  If this fails, break the bulb and
> > observe.  Do it soon; it's a dying technology.
> >
> > "You can observe a lot by watching."  [Y. Berra]
> >
> > bc, disassembler of Leclanchés, lamps, vacuum cleaners, radios, etc.  by 
> > fourth grade.
> >
> >
> >
> >
> >
> > Herb Gottlieb wrote:
> >
> >    
> >
> > > The base of the bulb is divided into three parts which connect
> > > to three terminals in the 3-way bulb socket. Rotating the switch 
> > > of the 3-way socket connects either the 50W or 100W bulb filaments
> > > separately, or in series with each other
> > >
> > > Herb
> > >
> > > On Tue, 04 Apr 2006 21:32:46 -0400 "Anthony Lapinski"
> > > <Anthony_Lapinski@pds.org> writes:
> > >
> > >
> > >      
> > >
> > > > I'm just finishing my unit on electricity, and have three 
> > > > semi-related
> > > > circuit questions dealing with everyday phenomena.
> > > >
> > > > 1. A three-way bulb has two filaments, often 50 W and 100 W, which 
> > > > can be
> > > > connected separately or together. How is the base of such a bulb 
> > > > made, and
> > > > how are the filaments wired in it?
> > > >
> > > > 2. I recently read that an electric blanket (with three heat 
> > > > settings)
> > > > works in a similar fashion, but that the two resistive elements are
> > > > identical. I am trying to visualize the circuit diagram. Are these
> > > > elements wired in parallel, with switches on each side of the 
> > > > branch, and
> > > > a separate wire connecting the resistors? This would allow each 
> > > > resistor
> > > > to operate independently (in parallel) or together (in series).
> > > >
> > > > 3. An auto rear window defroster operates on 12 V. I believe the 
> > > > elements
> > > > are connected in parallel, and run across much of the back window. 
> > > > Does
> > > > anyone know the resistance of a given element, so I can get the 
> > > > total
> > > > resistance, current, power, etc? Or is it different for each car?
> > > >
> > > > Thanks in advance for your insights and answers!
> > > >
> > > > _______________________________________________
> > > > Forum for Physics Educators
> > > > Phys-l@carnot.physics.buffalo.edu
> > > > https://carnot.physics.buffalo.edu/mailman/listinfo/phys-l
> > > >
> > > >
> > > >   
> > > >
> > > >        
> > > _______________________________________________
> > > Forum for Physics Educators
> > > Phys-l@carnot.physics.buffalo.edu
> > > https://carnot.physics.buffalo.edu/mailman/listinfo/phys-l
> > >
> > >
> > >
> > >
> > >      
> > _______________________________________________
> > Forum for Physics Educators
> > Phys-l@carnot.physics.buffalo.edu
> > https://carnot.physics.buffalo.edu/mailman/listinfo/phys-l
> >
> >    
>
>
> _______________________________________________
> Forum for Physics Educators
> Phys-l@carnot.physics.buffalo.edu
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>
>
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