# Is $\rho=\frac{E}{J}$ a generalisation of $R=\frac{V}{i}$?

Mathematically, by relating the intrinsic quantities like drift velocity,relaxation time etc., it is easy to show that

$$\rho=\frac{E}{J}$$

and

$$R=\frac{V}{i}$$

are true.

But, is it correct to say the the first equation is really a generalisation of the second equation? If yes why?

$\rho$ is a property of a material, $R$ is a property of a resistor or some other specific object made out of some material or a combination of materials. They are related, but neither one is a generalization of the other.