What is the electrical resistivity of aluminum?

What is the electrical resistivity of aluminum?

• A. 1.0 x 10^-6 ohm m
• B. 2.83 x 10^-8 ohm m
• C. 16.0 x 10^-8 ohm m
• D. 5.0 x 10^-8 ohm m

Answer: (B)

Electrical resistivity is a material property that tells how strongly a material opposes the flow of electric current per unit length and cross-section. For aluminum at room temperature, this value is about 2.8 × 10^-8 ohm-meters, a standard figure used in engineering tables. The rounded value 2.83 × 10^-8 ohm m matches that widely cited figure, making it the best choice. The other options are not appropriate for aluminum at 20°C—they would imply a much higher resistivity (or different temperature conditions), which doesn’t align with aluminum’s known room-temperature resistivity.

Electrical resistivity is a material property that tells how strongly a material opposes the flow of electric current per unit length and cross-section. For aluminum at room temperature, this value is about 2.8 × 10^-8 ohm-meters, a standard figure used in engineering tables. The rounded value 2.83 × 10^-8 ohm m matches that widely cited figure, making it the best choice. The other options are not appropriate for aluminum at 20°C—they would imply a much higher resistivity (or different temperature conditions), which doesn’t align with aluminum’s known room-temperature resistivity.