Length of a conductor vs. Resistance

[yeveat]

so i plotted a graph for length of a conductor vs. the resistance to the corresponding the lengths. i observed two "peaks" on the graph. I am not sure how to explain it but it's definitely not a linear relationship. It's like a bunny bouncing diagonally toward toward +y and +x (But there are two bounces) it looks like ")" but its sideways with the peak at the top and there are two of them connected diagonally.. I am sorry if I am not explaining this well, but I am just so confused. why is this happening?

 

[leinadle]

What is the source of your data?

 

[yeveat]

im doing a play doh conductivity lab and i plotted different lengths of Play Doh vs. corresponding resistance to the lengths. i just don't know how to analyze the graph. I can't figure out how to post my graphs on here so I am posting a link of a picture that look similar to this.

http://img.springerimages.com/Image...iaObjects/WATER_11665_2009_9560_Fig3_HTML.jpg

see how there are two "leaps"? that's how it is like for mine.

 

[lightarrow]

Don't know what's a "Play Doh" but data are meaningless in the absence of an approximate evaluation of their errors. which is the precision of measure of length and of resistance? Are you completely sure that the section of the body doesn't vary at all along its lenght? And what about its chemical composition? It's an alloy or a semiconductor or what else? Its shape? How exactly does the apparatus measures the resistance?

 

[Redbelly98]

http://img.springerimages.com/Image...iaObjects/WATER_11665_2009_9560_Fig3_HTML.jpg

Your data sure looks linear to me.

If you're wondering why it isn't perfectly linear, it's because this is experimental data. :-)

EDIT added:
One possibility is that the cross-sectional area of the Play-Doh was not consistent for the different samples.