Re: [Phys-l] three-way bulb

[Herb Gottlieb <herbgottlieb@juno.com>]

Yes, You are correct! It should be series rather than parallel.

                 I goofed on  this one.

                                      Herb


On Wed, 05 Apr 2006 08:02:16 -0700 Bernard Cleyet
<bernardcleyet@redshift.com> 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!
> > >
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> > >
> > >
> > >    
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