I was looking at the derivation of drift velocity of free electrons in a conductor in terms of relaxation time of electrons.
Here a metallic conductor XY of length $\ell$ is considered and having cross sectional area A. A potential difference $V$ is applied across the conductor XY. Due to this potential difference an electric field $E$ is produced. The magnitude of electric field strength is $E = V/\ell$.
I dont understand this part. How is electric field strength potential difference divided by length. Where am I lagging in my concepts?