Length of a conductor vs. Resistance

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Discussion Overview

The discussion revolves around the relationship between the length of a conductor and its resistance, specifically in the context of an experiment using Play-Doh as a conductive material. Participants explore the observed non-linear behavior in the plotted data and seek explanations for the unexpected results.

Discussion Character

  • Exploratory
  • Technical explanation
  • Debate/contested

Main Points Raised

  • One participant describes a graph showing two peaks in resistance as the length of the conductor increases, suggesting a non-linear relationship.
  • Another participant inquires about the source of the data to understand its validity.
  • A participant clarifies that the experiment involves measuring resistance of different lengths of Play-Doh and expresses confusion about how to analyze the resulting graph.
  • Concerns are raised regarding the precision of measurements, including potential variations in the cross-sectional area, chemical composition, and shape of the Play-Doh, which could affect resistance readings.
  • One participant suggests that the data appears linear and attributes deviations from linearity to the nature of experimental data, proposing that inconsistencies in the cross-sectional area might explain the observed peaks.

Areas of Agreement / Disagreement

Participants express differing views on the nature of the relationship between length and resistance, with some suggesting linearity and others noting non-linear characteristics. The discussion remains unresolved regarding the interpretation of the data and the factors influencing the results.

Contextual Notes

Participants highlight potential limitations in the experimental setup, including measurement errors, variations in material properties, and the method of resistance measurement, which are not fully addressed.

yeveat
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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?
 
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What is the source of your data?
 
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.
 
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?
 
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