Aluminum and Copper Wires - Electrical Resistance vs. Cross-Sectional Area
Electrical resistance in single core conductors:
| Cross Sectional Area (mm2) | Resistance (ohm/km) | |
|---|---|---|
| Copper | Aluminum | |
| 0.5 | 34.5 | 53 |
| 0.75 | 23 | 35.3 |
| 1.0 | 17.2 | 26.5 |
| 1.5 | 11.5 | 17.7 |
| 2.5 | 6.9 | 10.6 |
| 4.0 | 4.3 | 6.6 |
| 6.0 | 2.9 | 4.4 |
| 10 | 1.7 | 2.7 |
| 16 | 1.1 | 1.7 |
| 25 | 0.69 | 1.1 |
| 35 | 0.49 | 0.76 |
| 50 | 0.34 | 0.53 |
| 70 | 0.25 | 0.38 |
| 95 | 0.18 | 0.28 |
| 120 | 0.14 | 0.22 |
| 150 | 0.11 | 0.18 |
| 185 | 0.093 | 0.14 |
| 240 | 0.072 | 0.11 |
| 300 | 0.058 | 0.088 |
| 400 | 0.043 | 0.066 |
| 500 | 0.035 | 0.053 |
| 630 | 0.027 | 0.042 |
- values are based on electrical resistivity for copper 1.724 x 10-8 Ω m (0.0174 μΩ m) and electrical resistivity for aluminum 2.65 x 10-8 Ω m (0.0265 μΩ m)
- AWG, diameter mil, circular mil, diameter in mm and area in mm2
- Ohm's Law
Download and print Copper and Aluminum Wire - Electrical Resitance chart
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