Re: [Phys-L] [BULK] Graphite resistivity

["Lulai, Paul" <plulai@stanthony.k12.mn.us>]

I believe that standard play doh doesn't work. It is possible to make
conductive and resistor play doh*.  I suppose standard play do might work
for measuring resistance. But it might have too high of a resistivity
unless it is dooed with a salt solution.

* Ann Marie Thomas at UST (St Paul MN) has been pushing this a lot the past
few years.
https://www.google.com/url?sa=t&source=web&rct=j&url=http://www.stthomas.edu/SquishyCircuits&ved=0ahUKEwi-6_nSgqjLAhVJaD4KHTvJDbsQFgguMAE&usg=AFQjCNF1mSfyIalPpwFKLibsFH67p6XecA&sig2=2Bwku-2ljX2qmt4MCVdgfw
On Mar 4, 2016 3:49 PM, "Anthony Lapinski" <alapinski@pds.org> wrote:

> At the NJ Science Convention years ago, I learned about a similar activity
> using Play-Doh. You can roll it into a cylinder and measure length and
> thickness. Hook it to a viariac, set the voltage, measure current, find
> resistance. (You could also determine resistivity.). Then, roll it into a
> longer cylinder and repeat. I have not tried it, but it's low tech and fun!
>
> Phys-L@Phys-L.org writes:
> > Hello.
> > I am getting ready to do a resistivity lab that I've done for a decade but
> > I ran into a problem. The art pencils that I've been using are gone. They
> > apparently vaporized along with my packet of materials from an old aapt
> > workshop a decade or more ago.
> > I remember that art pencils were better because...
> > I don't remember...
> > I am tempted to pick up softer leaded pencils so the lead would get into
> > the cracks of the paper.
> > Does anyone have a quick recommendation?
> > Thanks for your help.
> > Paul.
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