Resistance And Conductance
By DarthVader
Date: 2022-06-13
Topic: 127 see comments
Post views: 1041
Resistance And Conductance
Resistance, R - (Ω)
The resistance, R, of an electrical component can be though of as a measure of how difficult it is for an electric current to flow through the component. The SI unit of resistance is the ohm (Ω).
Resistivity, ρ - (Ω m)
Resistivity, ρ, is a property of a material that relates the resistance of a piece of material to its dimensions.
For a material with resistance R (in Ω), length l (in m) and cross sectional area A (in m2), the resistivity p has units of ohm metres (Ω m) and is given by:
resistivity = resistance × area / length
or:
ρ = R × A / l
Conductance, G - (Ω-1) or (S)
Conductance, G, is a measure of how easy it is for a current to flow through an electrical component.
Its SI unit is: Ω-1 or siemens (S), and mathematically it is the reciprocal of resistance:
G = 1 / R
Conductivity, σ - (S m-1)
Conductivity, σ, is a property of a material and has the SI units of siemens per metre (S m-1). It is the reciprocal of resistivity:
σ = 1 / ρ
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