# Calculate the resistance per meter

1. May 9, 2008

### looi76

1. The problem statement, all variables and given/known data

Calculate the resistance per meter at room temperature of a constant wire if diameter $$1.25mm$$. The resistivity of constant a at room temperature is $$5x10^-7\Omega{m}$$

2. Relevant equations

I'm not sure, but I think this is the right formula:
$$R = \frac{Pl}{A}$$

3. The attempt at a solution

$$Area = \pi \times \left(\frac{1.25 \times 10^{-3}}{2}\right)^2$$
$$A = 1.2 \times 10^{-6} m^2$$

What is Pl?

2. May 9, 2008

### jimmyting

P is the resistivity and L is the length of the wire, so you are really solving for R/L