Where:
| s |
= |
Electrical Conductivity
(MS/m or mS/cm) |
| r |
= |
Electrical Resistivity
(ohm-meter or mohms-cm) |
|
Resistivity (r) is an intrinsic property of a material relating to the materials resistance to the flow of electrical current. A high resistivity indicates that a material is not a good conductor of electricity. Resistivity is determined by measuring the electrical resistance over some length of material with a constant cross-section. The materials resistivity is the product of the resistance value and the cross-sectional area divided by the length as given in the following equation.
where
- ρ = resistivity (ohm meters)
- R = electrical resistance of a uniform specimen of the material (ohms)
- l = length of the specimen (measured in meters)
-
- A = cross-sectional area of the specimen (meters2)
Conductivity is calculated by simply taking the inverse of resistivity. A material with a resistivity of 1/58 ohm-meter will have a conductivity of 58 MegaSiemens per meter.
