# Test and Measurement World

## Test and Measurement World Terminology Section

One Stop For Your Test and Measurement Need

## Resistivity table-Iron, Copper, Aluminium, Gold, Silver, Tungsten

This page mentions resistivity table for various substances. The resistivity table covers resistivity values of Aluminium, Brass, Cadmium, Cobalt, Copper, Constantan, Carbon, Gold, Germanium, Glass, Iron, Lead, Manganin, Mercury, Nichrome, Nickel, Palladium, Platinum, Quartz, Silver, Silicon, Tungsten, Tantalum, Tin, Zinc etc.

### What is Resistance and its Resistivity?

➤The resistance is the property of a substance which opposes flow of current (or electrons) through it.
➤For length of wire (l) having cross section area (a), it is expressed by following equation.
Resistance (R) = ρ* l / a , Ohms
Where, ρ = Resistivity of the material (in Ohm-meters)
l = length of wire, (in meters)
a = cross section area of wire (in meter2)

• Resistance of conductor depends on various parameters viz. length, cross section area, type of material, temperature of the material.
• Resistivity varies with temperature.
• Good conductors of electricity possess low values of resistivity.
• Good insulators have high value of resistivity.

### Resistivity table

Following table mentions resistivity values of various substances in ohm-metres (Ω-m).

Substance name Resistivity in ohm-metre
Aluminium 2.65 x 10-8
Brass About (0.6 to 0.9) x 10-7
Cobalt 5.6 x 10-8
Copper 1.7 x 10-8
Constantan 49 x 10-8
Carbon (Graphite) between 3 to 60 x 10-5
Gold 2.4 x 10-8
Germanium 4.6 x 10-1
Glass 1014
Iron 1.0 x 10-7
Manganin 4.2 x 10-7
Mercury 98 x 10-8
Nichrome 1.1 x 10-6
Nickel 7 x 10-8
Platinum 0.98 x 10-7
Quartz 7 x 1017
Silver 1.6 x 10-8
Silicon 6.4 x 102
Tungsten 4.9 x 10-8
Tantalum 1.3 x 10-7
Tin 1.1 x 10-7
Zinc 5.5 x 10-8

Following are the links to other useful measurements available on Test and Measurement World website.
Difference between EVM vs subcarriers and EVM vs symbols
Current measurement vs Voltage measurement
Inductance measurement vs Capacitance measurement
Difference between Power and Energy measurements
EMC measurement vs EMI measurement
Electric and Magnetic Field Measurements

### What is difference between or comparison between

Following links mention difference or comparison between various equipments:
comparison between VSG and VSA
DIfference between SNA ans VNA
Oscilloscope Bandwidth versus Rise time
Oscilloscope vs Logic Analyzer
Difference between Oscillscope types
Comparison between spectrum and network analyzer