# 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