I was trying to simulate two serpentine resistors on COMSOL multiphysics with exactly the same length, width and thickness. I drew them on AutoCAD. The only difference between the two resistors is the number of bends. For resistor(1), number of bends is only 2, while for resistor(2), number of bends is 18.
After running simulation on AC/DC module and Electric Currents (ec) sub module, resistance values came as the following:
Resistor(1) = 13.221 ohm (2 number of bends)
Resistor(2)= 12.654 ohm (18 number of bends)
I expected that the number of bends will not affect the resistance value, but it actually does in an inverse manner (though not much, but it does) Is anyone aware why would the number of bends affect the resistance value?
Resistor(1): Length:337mm; Width: 1mm; Thickness: 0.2mm; Number of bends:2
Resistor(2): Length:337mm; Width: 1mm; Thickness: 0.2mm;Number of bends:18
Resolution: Extra fine.
Minimum Element Size: 0.18mm.
Maximum Element Size: 4.2mm.
Maximum Element Growth Rate: 1.35
Resolution of Narrow Regions: 0.8
Effect of meshing resolution on resistance values: