The resistance per unit length of wires of various metals is tabulated here. Values were calculated from resistivity values in the tables “Electrical Resistivity of Pure Metals” and “Electrical Resistivity of Selected Alloys”, which appear in Section 12. In practice, resistance may vary because of differing heat treatments and metal composition. The values in Table 2 refer to 20 °C, but values at other temperatures may be calculated from the following resistivity data.
Metal | 0 °C | 20 °C | 25 °C | 100 °C |
Aluminum | 2.417 | 2.650 | 2.709 | 3.56 |
Brass (70% Cu, 30% Zn) | 5.87 | 6.08 | 6.13 | 6.91 |
Constantan (60% Cu, 40% Ni) | 45.43 | 45.38 | 45.35 | 45.11 |
Copper | 1.543 | 1.678 | 1.712 | 2.22 |
Nichrome (79% Ni, 21% Cr) | 107.3 | 107.5 | 107.6 | 108.3 |
Platinum | 9.6 | 10.5 | 10.7 | 13.6 |
Silver | 1.467 | 1.587 | 1.617 | 2.07 |
Tungsten | 4.82 | 5.28 | 5.39 | 7.18 |
Metal | AWG 0 8.252 mm | AWG 2 6.543 mm | AWG 4 5.189 mm | AWG 6 4.115 mm | AWG 8 3.264 mm | AWG 10 2.588 mm | AWG 12 2.053 mm | AWG 14 1.628 mm | AWG 16 1.291 mm | AWG 18 1.024 mm | AWG 20 0.8118 mm | AWG 22 0.6439 mm | AWG 24 0.5105 mm | AWG 26 0.4049 mm | AWG 28 0.3211 mm | AWG 30 0.2548 mm | AWG 32 0.2019 mm | AWG 34 0.1601 mm | AWG 36 0.1270 mm | AWG 38 0.1007 mm | AWG 40 0.07988 mm |
Aluminum | 0.000495 | 0.000788 | 0.00125 | 0.00199 | 0.00317 | 0.00504 | 0.0080 | 0.0127 | 0.0202 | 0.0322 | 0.0512 | 0.0814 | 0.129 | 0.206 | 0.327 | 0.520 | 0.828 | 1.32 | 2.09 | 3.33 | 5.29 |
Brass | 0.00114 | 0.00181 | 0.00287 | 0.00457 | 0.00727 | 0.0115 | 0.0184 | 0.0292 | 0.0464 | 0.0738 | 0.117 | 0.187 | 0.297 | 0.472 | 0.751 | 1.19 | 1.9 | 3.02 | 4.80 | 7.63 | 12.1 |
Constantan | 0.00848 | 0.0135 | 0.0214 | 0.0341 | 0.0542 | 0.0863 | 0.137 | 0.218 | 0.347 | 0.551 | 0.877 | 1.39 | 2.22 | 3.52 | 5.60 | 8.90 | 14.2 | 22.5 | 35.8 | 57.0 | 90.5 |
Copper | 0.000314 | 0.000499 | 0.000793 | 0.00126 | 0.00200 | 0.00319 | 0.00507 | 0.00806 | 0.0128 | 0.0204 | 0.0324 | 0.0515 | 0.0820 | 0.130 | 0.207 | 0.329 | 0.524 | 0.833 | 1.32 | 2.11 | 3.35 |
Nichrome | 0.0201 | 0.0320 | 0.0508 | 0.0808 | 0.128 | 0.204 | 0.325 | 0.516 | 0.821 | 1.30 | 2.08 | 3.30 | 5.25 | 8.35 | 13.3 | 21.1 | 33.6 | 53.4 | 84.9 | 135 | 214 |
Platinum | 0.00196 | 0.00312 | 0.00496 | 0.00789 | 0.0125 | 0.0200 | 0.0317 | 0.0504 | 0.0802 | 0.127 | 0.203 | 0.322 | 0.513 | 0.815 | 1.30 | 2.06 | 3.28 | 5.22 | 8.29 | 13.2 | 20.9 |
Silver | 0.000297 | 0.000472 | 0.000750 | 0.00119 | 0.00190 | 0.00302 | 0.00479 | 0.00762 | 0.0121 | 0.0193 | 0.0307 | 0.0487 | 0.0775 | 0.123 | 0.196 | 0.311 | 0.496 | 0.788 | 1.25 | 1.99 | 3.17 |
Tungsten | 0.00099 | 0.00157 | 0.00250 | 0.00397 | 0.00631 | 0.0100 | 0.0159 | 0.0254 | 0.0403 | 0.0641 | 0.102 | 0.162 | 0.258 | 0.410 | 0.652 | 1.03 | 1.65 | 2.62 | 4.17 | 6.63 | 10.5 |
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