Aluminum Vs. Copper Conductivity

••• Zedcor Wholly Owned/ Images

Electrical conductivity is the measure of how well a substance conducts electricity. It is expressed as 1/(Ohms-centimeters) or mhos/cm. Mho is the name that was chosen for the inverse of Ohms.

Physical Descriptions

Copper is a soft and malleable metal with a bright gold to a dull brown color. Aluminum is a silver-colored metal that is lighter and stronger than copper.


The two metals are close on the scale of conductivity, with copper having the more desirable characteristic. The conductivity of copper is about 0.6 megamho/cm while that of aluminum is about 0.4 megamho/cm.

Wire Resistance

A one-meter long wire with a cross section of one square millimeter has a resistance of 1.7 milliohms (.0017 Ohm) if it is made of copper, and 2.5 milliohms if it is aluminum.

Use in Wiring

Due to its excellent electrical properties, copper is used extensively for electrical wiring. In power distribution, aluminum is sometimes used instead of copper. Aluminum costs and weighs only about one third as much as copper.

Safety of Aluminum Wiring

Aluminum was once used in home wiring but it corrodes easily, which can lead to high resistance and heat buildup at connection points. The residential use of aluminum wire was discontinued in the 1970's due to this hazard.

Related Articles

How to Calculate Conductance
Physical and Chemical Properties for the Element Aluminum
Aluminum Vs. Steel Conductivity
Which Would Be the Best Insulator: Diamond, Gold, Lead...
What Metals Make Good Conductors of Electricity?
What Are Some Good Conductors?
Copper Vs. Silver Wire Conductivity
How to Determine if Copper Is Real
List Of Conductors
Physical Characteristics of Aluminum Oxide
How to Use a Resistor for 12 Volt to 5 Volt
The Effects of Oxidation on Copper
What Is a Ferrite Clamp?
How to Test Brass at Home
How to Convert a 9V Battery to 3.3V DC
How to Calculate Electrical Winding Wires by Weight...
3 Different Forms of Brass
What Is Mexican Silver?
Difference in Weight of Steel Versus Cast-Iron
How to Test the Conductivity of Metal

Dont Go!

We Have More Great Sciencing Articles!