Quote Originally Posted by Bigchrome View Post
Conductive pen would be way too conductive! I used a 2B pencil this morning took me 17.8s (timed) and I went from (1.55v set) 1.48 to 1.53 and no variation under load.
what is the resistance for a no.2 pencil?...answer!
we assumed that the contact resistance of the pencil was negligible.
http://www.sci-ed-ga.org/modules/mat...20Addendum.doc