# Describing sources

## Introduction

We distinguish two types of sources:

• an imposed electric current density (J0)
• an imposed electric potential (V0)

The modeling of these two types of sources in Flux software is detailed in the following blocks.

## Imposed density of electric current

It is possible to impose an electric current density (J0) on a region by using the regions known as non-material of the type: imposed current density

The imposed density of current on a face region (3D) or on a line region (2D/3D) is expressed in A/mm2 or in A/mm respectively. This can be uniform or space dependent.

## Imposed electric potential

It is possible to impose an electric potential (V0) on a region by using the regions known as non-material of type: imposed electric potential

The electric potential imposed on a surface region (3D) or on a line region (2D/3D) is expressed in Volts. This can be uniform or space dependent.