# Constant resistivity

## Presentation

This model defines a conductive isotropic or anisotropic material by its constant resistivity, which corresponds to a linear J(E) dependence.

## Mathematical model

In terms of the J(E) characteristic, this model is a straight line.

The corresponding mathematical formula is written:

J(E) = (1 / ρ )E

where: ρ is the resistivity of material [Ω.m]

## Anisotropic material

For an anisotropic material, this linear model consists of a group of three resistivity values.