Engineering Specification
ES-3U5T-1B257-AA
EMC Design Guide for Printed Circuit Boards
Frame 40 of 78
Rev. A
10/01/2002
Printed copies are uncontrolled
3.10. Resistance
Table 38 shows some wire characteristics (AWG is the American Wire Gauge).
Table 38. Resistance in Wires
AWG
Number of
strands
Strand
diameter
(inches)
Cable
diameter
(inches)
M
per foot
@ 20ûC
1
19 0.0664 0.332 0.1288
2
7 0.0974 0.292 0.1644
4
7 0.0772 0.232 0.2582
6
7 0.0612 0.184 0.4105
8
7 0.0486 0.147 0.6528
10 7
0.0385
0.116
1.028
12 7
0.0305
0.096
1.650
14 7
0.0242
0.073
2.624
16 7
0.0192
0.060
4.172
18 7
0.0152
0.048
6.636
20 7
0.0121
0.035
10.54
22
7 0.010 0.030 14.74
Equation 320 gives the resistance (R) of a solid copper slab:
wt
l
10
724
.
1
R
6
×
×
=
-
[]
Equation 320. Resistance in Copper
Where,
1.724x
x
x
x
10
-6
-cm equals the resistivity () of copper
t is the thickness in cm
w is the width in cm
l is the length of the slab in cm
Summary :
Resistance in Wires AWG Number of strands Strand diameter (inches) Cable diameter (inches) M per foot @ 20ûC 1 19 0.0664 0.332 0.1288 2 7 0.0974 0.292 0.1644 4 7 0.0772 0.232 0.2582 6 7 0.0612 0.184 0.4105 8 7 0.0486 0.147 0.6528 10 7 0.0385 0.116 1.028 12 7 0.0305 0.096 1.650 14 7 0.0242 0.073 2.624 16 7 0.0192 0.060 4.172 18 7 0.0152 0.048 6.636 20 7 0.0121 0.035 10.54 22 7 0.010 0.030 14.74 Equation 320 gives the resistance (R) of a solid copper slab: wt l 10 724 .
Tags :
resistance,copper,table,wire,printed,equation,awg,inches,slab,diameter,38,320,boards