Resistance formula is: R = ρL/A Where:
ρ: Resistivity constant of the material, in Ω.m
;L: Length of the wire, in meter
A: Cross sectional area of the wire, in m^2
R: Resistance, in ohms (Ω)
Metal Resistivity Table
Metal Resistivity (Ω . m) at 20 °C Temperature coefficient [K-1]
Silver 1.59 × 10-8 0.0038
Copper 1.68 × 10-8 0.0039
Gold 2.44 × 10-8 0.0034
Aluminum 2.82 × 10-8 0.0039
Calcium 3.36 × 10-8 0.00457
Tungsten 5.60 × 10-8 0.0045
Zinc 5.90 × 10-8 0.0037
Nickel 6.99 × 10-8 0.006
Iron 1.0 × 10-7 0.005
Platinum 1.06 × 10-7 0.00392
Tin 1.09 × 10-7 0.0045
Lead 2.2 × 10-7 0.0039
Manganin 4.82 × 10-7 0.000002
Constantan 4.9 × 10-7 0.000008
Mercury 9.8 × 10-7 0.0009
Nichrome 1.10 × 10-6 0.0004
Carbon 3.5 × 10-5 -0.0005
Germanium 4.6 × 10-1 -0.048
Silicon 6.40 × 102 -0.075