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## Main Question or Discussion Point

So, resistivity goes like [tex]\rho = R \frac{A}{l}[/tex] (where A = cross sectional area, l = length)

I solved for resistance and got [tex]R = \rho \frac{l}{A}[/tex]

If [tex]R = \rho \frac{l}{A} = \frac{V}{I}[/tex] would the current correspond to the ampacity of the material? Or, if you were to replace R in the first equation with V/I, what current value would be used in determining the resistivity of a material?

This is not a homework question. I just read about resistivity and now I'm trying to figure this out.

I solved for resistance and got [tex]R = \rho \frac{l}{A}[/tex]

If [tex]R = \rho \frac{l}{A} = \frac{V}{I}[/tex] would the current correspond to the ampacity of the material? Or, if you were to replace R in the first equation with V/I, what current value would be used in determining the resistivity of a material?

This is not a homework question. I just read about resistivity and now I'm trying to figure this out.