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Re: [Phys-l] three-way bulb



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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