## Physics for Scientists and Engineers: A Strategic Approach with Modern Physics (4th Edition)

$\Delta V = 0.87~V$
We can find the resistance: $R = \frac{\rho~L}{A}$ $R = \frac{\rho~L}{\pi~r^2}$ $R = \frac{(1.7\times 10^{-8}~\Omega~m)(20~m)}{(\pi)~(1.0\times 10^{-3}~m)^2}$ $R = 0.1082~\Omega$ We can find the potential difference: $\Delta V = I~R$ $\Delta V = (8.0~A)(0.1082~\Omega)$ $\Delta V = 0.87~V$