# PCB trace resistance
# Scope: Uniform rectangular copper conductor; temperature rise omitted.
# Status: illustrative worked example; engineering review pending.
# Inputs are example values. Checks are editable example requirements, not standards.

resistivity = 0.0000000168 ohm*m
length = 100 mm
width = 1 mm
thickness = 35 um
current = 1 A

resistance := resistivity*length/(width*thickness) [ohm]
drop := current*resistance [mV]
loss := current^2*resistance [W]

check voltage drop budget: drop <= 100 mV

scenario alternative: resistivity = 1.344e-08 ohm*m