Resistance Calculator
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
Aluminium
2.82 × 10-8
0.0039
Tungsten
5.60 × 10-8
0.0045
Platinum
1.06 × 10-7
0.00392
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
