Re: [Phys-l] CFLs

[ludwik kowalski <kowalskil@mail.montclair.edu>]

I suspect that  the "any electrical device" is an exaggeration. I  
would not trust a P or E reading for a device in which the current is  
very non-sinusoidal. For this one needs something much more expensive.  
Fortunately, this can be tested, by using a calorimeter. A good  
student project ?

Ludwik



On Apr 8, 2009, at 8:09 AM, Anthony Lapinski wrote:

> I just bought a Kill-A-Watt device for about $15 online. Can measure  
> V, I,
> P, and E for any electrical device.Also measures outlet frequency.  
> Very
> nice!
>
> Forum for Physics Educators <phys-l@carnot.physics.buffalo.edu>  
> writes:
> > Just measured:  112 V.  But that doesn't mean it isn't spiky.  And  
> > as for
> > the frequent bumps and vibrations, well yes, we have those.  So I  
> > guess
> > it's CFCs or kids...
> > ________________________________________
> > From: phys-l-bounces@carnot.physics.buffalo.edu
> > [phys-l-bounces@carnot.physics.buffalo.edu] On Behalf Of Brian  
> > Whatcott
> > [betwys1@sbcglobal.net]
> > Sent: Tuesday, April 07, 2009 8:29 PM
> > To: Forum for Physics Educators
> > Subject: Re: [Phys-l] CFLs
> >
> > Philip Keller wrote:
> > > Well what have I been doing wrong?  I've tried a variety of brands  
> > > and
> > NONE have lasted more than 6 months.  Some were in recessed  
> > fixtures (I
> > am told that is a no-go) but others not.  It is hard to pay $7 for  
> > a bulb
> > that doesn't last long enough to pay back the investment.  I feel  
> > guilty
> > not buying them and then I feel guilty when they have to be thrown  
> > away...
> > You have spiky line power or
> > an intermittent neutral/ground connection or
> > a high level of vibration in the ceiling area or
> > frequent bumps in the ceiling area.
> >
> > Wildly guessing now.... I expect the incandescents you formerly used
> > also failed rather quickly?
> >
> > You are not alone.
> >
> > Brian W
> >
> > _______________________________________________
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> > _______________________________________________
> > Forum for Physics Educators
> > Phys-l@carnot.physics.buffalo.edu
> > https://carnot.physics.buffalo.edu/mailman/listinfo/phys-l
>
>
> _______________________________________________
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- - - - - - - - - - - - - -
Ludwik Kowalski, a retired physics teacher and an amateur journalist.  
Updated links  to publications and reviews are at:

http://csam.montclair.edu/~kowalski/cf/   http://csam.montclair.edu/~kowalski/my_opeds.html 
   http://csam.montclair.edu/~kowalski/revcom.html