Resistivities of common materials

Resistivity: Measure of the resisting power of a specified material to the flow of electric current.

Resistance: The property of a material which opposes the flow of electric current through it.

Capacitance: The amount of charge that can be stored inside a capacitor at a given voltage.

MaterialResistivity(ohms/m)Usage
Silver1.64 × 10⁻⁸Conductor
Copper1.72 × 10 ⁻⁸Conductor
Aluminum2.8 × 10⁻⁸Conductor
Gold 2.45 × 10⁻⁸Conductor
Iron1.23 × 10⁻⁷Conductor
Lead2.2 × 10⁻⁷Confuctor
Germanium4.7 × 10⁻¹Semiconductor
Silicon6.4 × 10²Semiconductor
Paper10¹⁰Insulator
Mica5 × 10¹¹Insulator
Glass10¹²Insulator
Teflon3 × 10¹²Insulator

Example:

Calculate the resistance of an Al wire that is 2m long and circular cross section with a diameter of 1.5mm.

Solution

R=ρL/A.   Where: R=resistance, ρ= resistivity, L= length, A= Area.

R= (2.8 × 10^-8Ω/m × 2m)/1.768×10^-6m² = 31.69Ω

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