- #1
cycrups
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Homework Statement
- In the physics lab the following values of a resistor have been recorded as a function of the temperature:
20
30
40
50
60
Resistance R/
213
143
98
69
47It is said that the temperature dependence of R can be described by the following equation: R(1/T)=a*exp(b/T) , with T as absolute temperature in Kelvin.
- Plot the natural logarithm of R as a function of 1/T and find from that graph the parameters a, and b. Use the graph paper at the last page!
- Do you agree that the above equation gives a good description of the data?
- Which value of R do you expect for a temperature of 100°C?
Homework Equations
R(1/T)=a*exp(b/T)
The Attempt at a Solution
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So I drew the graph on excel http://imgur.com/RPowO0o (in Kelving of course because that's what he asked for)
What I don't know is how will I find a and b if there are two unknowns in one formula. I have though of b and a to be the mean of each the Temp and the Resistance in the graph as the teacher stated I should be able to solve them from the graph but I have no idea.