Miscellaneous data
Resistance of copper conductors (approximate)
SWG no. |
Diameter (mm) |
Cross-sectional area (mm2) |
Resistance/m (Ω) |
10 |
3.25 |
8.3 |
0.002 |
12 |
2.64 |
5.48 |
0.003 |
14 |
2.03 |
3.24 |
0.005 |
16 |
1.62 |
2.08 |
0.008 |
18 |
1.22 |
1.17 |
0.015 |
20 |
0.91 |
0.66 |
0.026 |
22 |
0.71 |
0.40 |
0.043 |
24 |
0.56 |
0.25 |
0.070 |
26 |
0.46 |
0.16 |
0.10 |
28 |
0.38 |
0.11 |
0.15 |
30 |
0.32 |
0.0B |
0.22 |
Standard prefixes for multiples and submultiples
Multiplication |
|
Prefix |
Symbol |
1 000 000 000 |
= 109 |
giga |
G |
1 000 000 |
= 106 |
mega |
M |
1000 |
= 103 |
kilo |
k |
1/1000 |
= 10–1 |
milli |
m |
1/1 000 000 |
= 10–6 |
micro |
μ |
1/1000 000 000 |
= 10–9 |
nano |
n |
Decibel equivalents for power and voltage ratios
Decibels |
Power ratio |
Voltage ratio |
0 |
1 |
1 |
1 |
1.26 |
1.12 ... |
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