Resistivity Table / Chart

- table or chart of the electrical resistivity of a variety of materials many of which are used in electronics equipment including the resistivity of copper, resistivity of brass and the resistivity of aluminium.

The resistivity table given below contains many of the substances widely used in electronics including the resistivity of copper, the resistivity of aluminium, gold and silver..

These two properties are particularly important and will often determine whether a substance can be used in the manufacture of a wide variety of electrical and electronics components from wire to components such as resistors, potentiometers and many more.

Table of Resistivity
for Different Substances
Substance Resistance at 20°C
Ohm metres
Aluminium 2.8 x 10-8
Antimony 3.9 x 10-7
Bismuth 1.3 x 10-6
Brass ~0.6 - 0.9 x 10-7
Cadmium 6 x 10-8
Cobalt 5.6 x 10-8
Copper 1.7 x 10-8
Gold 2.4 x 10-8
Carbon (Graphite) 1 x 10-5
Germanium 4.6 x 10-1
Iron 1.0 x 10-7
Lead 1.9 x 10-7
Manganin 4.2 x 10-7
Nichrome 1.1 x 10-6
Nickel 7 x 10-8
Palladium 1.0 x 10-7
Platinum 0.98 x 10-7
Quartz 7 x 1017
Silicon 6.4 x 102
Silver 1.6 x 10-8
Tantalum 1.3 x 10-7
Tin 1.1 x 10-7
Tungsten 4.9 x 10-8
Zinc 5.5 x 10-8

Many of the materials found in the resistivity table above are widely used in electronics. As such the resistivity of copper and the resistivity of brass are important.

Aluminium and particularly copper are used for their low levels of resistance. Most wire used these days for interconnections is made from copper as it offers a low level of resistivity at an acceptable cost.

The resistivity of gold is also important because gold is used in some critical areas despite its cost. Often gold plating is found on high quality low current connectors where it ensures the lowest contact resistance. Silver is not so widely used because it tarnishes and this can result in higher contact resistances. The oxide can also under some circumstances act as a rectifier which may cause some annoying problems in RF circuits.

The resistivity of tantalum also appears in the table. It is used in capacitors - nickel and palladium are used in the end connections for many surface mount components such as capacitors. Quartz finds its main use as a piezo-electric resonant element. Quartz crystals are used as frequency determining elements in many oscillators where its high value of Q enables very frequency stable circuits to be made. They are similarly used in high performance filters.

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