What are the most relevant physical properties for copper and aluminium in electrical applications?

The most important characteristics are listed in the table below:

Property Copper(Cu-ETP) Aluminium(1350) Units
Electrical conductivity (annealed) 101 61 %IACS
Electrical resistivity (annealed) 1.72 2.83 mOhm-cm
Thermal conductivity at 20°C 397 230 W/mK
Coefficient of expansion 17 x 10-6 23 x 10-6 /°C
Tensile strength (annealed 200-250 50-60 N/mm2
Tensile strength (half-hard) 260-300 85-100 N/mm2
0.2% proof strength (annealed) 50-55 20-30 N/mm2
0.2% proof strength (half-hard) 170-200 60-65 N/mm2
Elastic modulus 116-130 70 N/mm2
Fatigue Strength (annealed) 62 35 N/mm2
Fatigue Strength (half hard) 117 50 N/mm2
Specific heat 385 900 J/kgK
Density 8.91 2.70 g/cm3
Melting Point 1083 660 °C
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