1) You take some data with Nichrome wire and you have a plot of R vs. LA -1 with

Question

1) You take some data with Nichrome wire and you have a plot of R vs. LA-1 with the following equation
from your computer y = 0.999 * x + 1.1.
Someone gives you the same wire with a length of 10 [meters] and X-sec. Area of 0.34 [mm2].
What resistance willyou probably measure for the entire length of wire? You measure it the same way as you measured your data.
                                        ----------------[Ohms]

2) You take some data with Nichrome wire and you have a plot of R vs. LA-1 with the following equation
from your computer y = 0.956 * x + 1.
What is the resistivity for this wire?
[?mm2m-1]

3) You take some data with Nichrome wire and you have a plot of R vs. LA-1 with the following equation
from your computer y = 0.941 * x + 0.6.
What is the conductivity for this wire?
[?-1mm-2m]

Explanation / Answer

a)

Here X-axis Represent s=(L/A) or LA-1

Y-axi represents Resistance

L/A =10/0.34 =29.4 m/mm2

so

Y=0.999*29.4+1.1

Y=30.48 ohms

b)

Resistivity

p=0.956 ohm-mm2m-1

c)

Conductivity

sigma=1/p =1/0.956 =1.06 ohm-1mm-2m

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