Determine the resistance of an aluminum wire with a length of 100 m and a cross-sectional area of 2.8 mm2.

The resistance of an aluminum wire can be calculated using the formula:
R = ρ * l / S, where ρ is the resistivity of the aluminum wire (we take ρ = 0.028 Ohm * mm ^ 2 / m), l is the length of the aluminum wire (l = 100 m), S is the cross-sectional area of the aluminum wire (S = 2.8mm ^ 2).
Let’s calculate the resistance of the aluminum wire:
R = ρ * l / S = 0.028 * 100 / 2.8 = 1 ohm.
Answer: The resistance of the aluminum wire is 1 ohm.