Tables:
Electrical values.
- Specific electrical resistance
ρ and conductance for conductors at 20°C
- Specific electrical resistance
ρ of insulators
- Electrical coefficients of temperature α at 20°C
- Dielectric constant εr
- Series of electrochemical tension
.
Specific electrical resistance
ρ and conductance for conductors at 20°C
|
| Material |
|
|
Material |
|
|
| Strained steel |
1 |
1 |
Brass Ms63 |
0,071 |
14 |
| Ingot steel |
0,13 |
7,7 |
Magnesium |
0,0435 |
23 |
| Pure steel |
0,10 |
10 |
Manganese |
0,423 |
2,37 |
| Aluminum |
0,0278 |
36 |
Mercury |
0,941 |
1,063 |
| Antimony |
0,417 |
2,4 |
Nickel |
0,087 |
11,5 |
| Cadmium |
0,076 |
13,1 |
Niquelín |
0,5 |
2,0 |
| Coal |
40 |
0,025 |
Gold |
0,0222 |
45 |
| Copper |
0,0172 |
58 |
Silver |
0,016 |
62,5 |
| Constantan |
0,48 |
2,08 |
Artificial Silver |
0,369 |
2,71 |
| Chromium-Ni-Fe |
0,10 |
10 |
Platinum |
0,111 |
9 |
| Tin |
0,12 |
8,3 |
Lead |
0,208 |
4,8 |
| Graphite |
8,00 |
0,125 |
Wolfram |
0,059 |
17 |
| Brass Ms58 |
0,059 |
17 |
Zinc |
0,061 |
16,5 |
Specific
electrical resistance ρ of insulators
|
| Material |
ρ [ Ω cm ] |
Material |
ρ [ Ω cm ] |
| Paraffin oil |
1018 |
Marble |
1014 |
| Water of sea |
106 |
Mica |
1017 |
| Distilled water |
109 |
Pure paraffin |
1022 |
| Artificial amber |
1024 |
Porcelain |
1020 |
| Bakelite |
1016 |
Humid earth |
108 |
| Hard rubber |
1016 |
Glass |
1017 |
Electrical
coefficients of temperature α at 20°C
|
| Material |
α 20° [1/°C] |
Material |
α 20° [1/°C] |
| Fused steel |
+0,00660 |
Manganio |
+0,00001 |
| Aluminum |
+0,00390 |
Mercury |
+0,00090 |
| Coal |
-0,00030 |
Nickel |
+0,00400 |
| Copper |
+0,00380 |
Niquelín |
+0,00023 |
| Constantan |
-0,00003 |
Silver |
+0,00377 |
| Tin |
+0,00420 |
Artificial silver |
+0,00070 |
| Graphite |
-0,00020 |
Platinum |
+0,00390 |
| Brass |
+0,00150 |
Zinc |
+0,00370 |
| Dielectric
constant εr |
| Insulating material |
εr
A/cm |
Insulating material |
εr
A/cm |
|
| Colza oil |
2,2 |
Hard rubber |
2,8 |
| Paraffin oil |
2,2 |
Vulcanized rubber
|
2,7 |
| Oil by root |
3 |
|
|
| Castor oil |
4,7 |
Lacquer |
3,5 |
| Mineral oil for
transformer |
2,2 |
Seal sealing wax |
4,3 |
| Olive oil |
3 |
Marble |
4 |
| Vegetal oil for
transformer |
2,5 |
Mica |
8 |
| Water |
80 |
Micanita |
5 |
| Air |
1 |
Paper |
2,3 |
| Insulation for cables |
2,5 |
Kitchen paper |
4,2 |
| Insulation for high
tension wires |
4,2 |
Paraffin |
2 , 2 |
| Insulation for telephone
wires |
1,5 |
Paraffin |
2,2 |
| Asbestos - rubber |
4 |
Slate |
4 |
| Bakelite |
2,7 |
Porcelain |
4,4 |
| Cardboard |
4,5 |
Fabric |
4 |
| Quartz |
4,5 |
Terpentina |
2,2 |
| Ebonite |
2,5 |
Glass |
5 |
| Volcanic fiber |
2,5 |
Glass (Zeiss) |
1,6 |
Series of
electrochemical tension .
(Difference of tensions referred
to Hydrogen electrode )
|
| Material |
Volts |
Material |
Volts |
| Steel |
-0,44 |
Mercury |
+0,85 |
| Aluminum |
-1,69 |
Nickel |
-0,25 |
| Cadmium |
-0,40 |
Gold |
+1,38 |
| Calcium |
-2,
76 |
Silver |
+0,80 |
| Calio |
-2,
92 |
Platinum |
+0,46 |
| Cobalt |
-0,29 |
Lead |
-0,13 |
| Copper |
+0,35 |
Sodium |
-2,71 |
| Chromium |
-0,56 |
Wolfram |
-0,58 |
| Tin |
-0,14 |
Zinc |
-0,76 |
| Hydrogen |
0,00 |
|
|
| Magnesium |
-2,34 |
|
|
| Manganese |
-1,10 |
|
|
|