Calculate the resistance per meter

[looi76]

Homework Statement

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 $$5x10^-7\Omega{m}$$

Homework Equations

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

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?

 

[jimmyting]

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

 

[Moetasim]

Pl stands for the length of the wire. To calculate the resistance per meter, we need to divide the total resistance of the wire by its length. So, we need to know the length of the wire in meters. Once we have that information, we can use the formula R = Pl/A to calculate the resistance per meter.