Question

What is the resistance of a 150m wire made of silver with cross sectional area of 0.60mm² ?

Answer 1

The resistance of a wire

$$R=\rho\frac{l}{A}$$

$$R=\rho\frac{l}{A}=1.59\times10^{-8}\times \frac{150}{0.60*10^{-6}}=4.0\:\Omega$$