SHEET RESISTANC

Units = Ohms per Square (Ω/sq) or (Ω/□)

Basic Concept

The resistance of one square of material, with a uniform thickness, is the same, regardless of size.

The Math

Where:

R = Resistance

= Material Resistivity

W = Width

L = Length

T = Thickness

A = Cross sectional Area = W T

 

Notice that if length and width are equal, then that term goes to 1 and only the resistivity and thickness matter.

 

Measurements

Sheet resistance measurements must be made with connections across the entire side of the square