Ohm law / Power
V
A
Ω
W
RMS / Peak-to-Peak
V
V
V
Frequency / Period
Hz
s
Voltage drop / Wire resistance
mm2
m
V
A
Voltage divider
V
Ω
Ω
V
x
ADC voltage
bits
fractions
V
V
fractions
dB difference
dB
dB
x
Resistor color code
Nice and simple More complicated with tables
Resistor / Capacitor code
Ω
F
AWG table

Ampacity °C is delta over ambient.

Gauge Diameter (mm) Area (mm2) Resistance (Ω/m) ΔT 30°C (A) ΔT 45°C (A) ΔT 60°C (A)
0000 11.684 107 0.0001608 195 230 260
000 10.405 85 0.0002028 165 200 225
00 9.266 67.4 0.0002557 145 175 195
0 8.251 53.5 0.0003224 125 150 170
1 7.348 42.4 0.0004066 110 130 145
2 6.544 33.6 0.0005127 95 115 130
3 5.827 26.7 0.0006465 85 100 115
4 5.189 21.2 0.0008152 70 85 95
5 4.621 16.8 0.001028
6 4.115 13.3 0.001296 55 65 75
7 3.665 10.5 0.001634
8 3.264 8.37 0.002061 40 50 55
9 2.906 6.63 0.002599
10 2.588 5.26 0.003277 30 35 40
11 2.305 4.17 0.004132
12 2.053 3.31 0.005211 20 25 30
Gauge Diameter (mm) Area (mm2) Resistance (Ω/m) ΔT 30°C (A) ΔT 45°C (A) ΔT 60°C (A)
13 1.828 2.62 0.006571
14 1.628 2.08 0.008286 15 20 25
15 1.45 1.65 0.01045
16 1.291 1.31 0.01317 18
17 1.15 1.04 0.01661
18 1.024 0.823 0.02095 10 14 16
19 0.912 0.653 0.02642
20 0.812 0.518 0.03331 5 11
21 0.723 0.41 0.042
22 0.644 0.326 0.05296 3 7
23 0.573 0.258 0.06679
24 0.511 0.205 0.08422 2.1 3.5
25 0.455 0.162 0.1062
26 0.405 0.129 0.1339 1.3 2.2
Gauge Diameter (mm) Area (mm2) Resistance (Ω/m) ΔT 30°C (A) ΔT 45°C (A) ΔT 60°C (A)
27 0.361 0.102 0.1689
28 0.321 0.081 0.2129 0.83 1.4
29 0.286 0.0642 0.2685
30 0.255 0.0509 0.3386 0.52 0.86
31 0.227 0.0404 0.4269
32 0.202 0.032 0.5383 0.32 0.53
33 0.18 0.0254 0.6788
34 0.16 0.0201 0.856 0.18 0.3
35 0.143 0.016 1.079
36 0.127 0.0127 1.361
37 0.113 0.01 1.716
38 0.101 0.00797 2.164
39 0.0897 0.00632 2.729
40 0.0799 0.00501 3.441
Wire diameter / Area / AWG
AWG
mm
mm2
Insulated color coded terminals
Color AWG mm2
green 24-20 0.25-0.5
red 20-16 0.5-1.5
blue 16-14 1.5-2.5
black 14-12 2.5-4
yellow 12-10 4-6
Imperial to metric drill sizes
Imperial (inch) Metric (mm)
1/8 3.18
5/32 3.97
3/16 4.76
7/32 5.56
1/4 6.35
9/32 7.14
5/16 7.94
11/32 8.73
3/8 9.53
13/32 10.32
7/16 11.11
15/32 11.91
1/2 12.7
9/16 14.29
5/8 15.88
11/16 17.46
3/4 19.05
13/16 20.64
7/8 22.23
1 25.4
1-1/8 28.58
1-1/4 31.75
1-3/8 34.93
Heat shrink diameter vs flat width
mm
mm
Diameter Flat width (approx.)
1 1.6
2 3.1
3 4.7
4 6.3
5 7.9
6 9.4
8 12.6
10 16
12 19
14 22
16 25
18 28
20 31
22 35
24 38
26 41
28 44
30 47
32 50
34 53
36 57
38 60
40 63
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