- #1
RJBRJ
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Hi, I'm doing a IB Physics internal assessment on how the length of a tube of playdoh in a straw relates to the resistance of that tube. I tested it by connecting a 150 ohm resistor to one end of the tube of playdoh and connected the two to a power supply.
My data at the different lengths all came out nicely and the graph to find the resistance at each length was almost perfectly linear; however, none of the graphs passed through the origin--they all intersect the x-axis at 1.25 to 1.5 volts. Why is this? Shouldn't it always pass through the origin, if it is Ohmic?
Thanks A TON for any help!
--
RJ
My data at the different lengths all came out nicely and the graph to find the resistance at each length was almost perfectly linear; however, none of the graphs passed through the origin--they all intersect the x-axis at 1.25 to 1.5 volts. Why is this? Shouldn't it always pass through the origin, if it is Ohmic?
Thanks A TON for any help!
--
RJ