Home / Examples / Electric Analysis [Coulomb] / Example 11: Conductor's Resistance

Example 11: Conductor's Resistance

General

A conductor bar that has a swelling in the middle compared to both ends is analyzed.
The resistance and the current density are solved.
Unless specified in the list below, the default conditions will be applied.

Results will vary depending on Femtet version and the PC environment.

Analysis Space

Item	Settings
Analysis Space	3D
Model Unit	mm

Analysis Conditions

To calculate the resistance, select Conductor at Material Type.

Item	Settings
Solver	Electric Analysis [Coulomb]
Analysis Type	Static Analysis (Resistance)
Options	N/A

Model

Create the bar by performing the boolean operations on the box-shaped solid bodies.

Electrodes are set on the I/O faces of the current with the electric wall boundary condition.

The electric potential is applied to the electrodes.

Body Attributes and Materials

Select the aluminum for the material.

Body Number/Type	Body Attribute Name	Material Name
3/Solid	Bone	001_Al *

* Available from the material DB

Boundary Conditions

Boundary Condition Name/Topology	Tab	Boundary Condition Type	Settings
V0/Face	Electric	Electric Wall	Electric Potential Specified 0 [V]
V1/Face	Electric	Electric Wall	Electric Potential Specified 1 [V]

Results

By clicking the [Resistance] tab on the table, the resistance R1-2 between the face of electrode 1 (with boundary condition V0) and
the face of electrode 2 (with boundary condition V1) is confirmed to be 2.33×10^-4 [Ω].

The vectors of the current density are shown below.

The current density is low at the thick portion.