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# Can the resistivity equation be changed to y=mx+c? watch

1. Hi,

Can the resistivity equation be changed to y=mx+c?

Thanks
Matt
2. (Original post by matt2minger)
Hi,

Can the resistivity equation be changed to y=mx+c?

Thanks
Matt

3. Basicly i am wanting to find out how resistacne varies with cross sectional area.
4. Yep.
5. (Original post by matt2minger)
Basicly i am wanting to find out how resistacne varies with cross sectional area.
It's all in the above equation:

R = resistance
rho = resistivity (a constant for a given material)
L = length
A=cross-sectional area

From the above you see that resistance is inversely proportional to area so as the area goes up the resistance goes down (you'd intuitively expect this since the electrons have more space to travel through). A graph of R against 1/A should be a straight line with gradient rho*L

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