The copper wire has a length of 2 meters and a cross-sectional area of 0.5. What is her resistance?

The resistance of the copper wire is calculated by the formula:
R = ρ * l / S, where ρ is the resistivity of copper (we take ρ = 0.018 Ohm * mm ^ 2 / m), l is the length of the copper wire (l = 2 m), S is the cross-sectional area of the copper wire (S = 0.5 mm ^ 2).
Let’s calculate the resistance of the copper wire:
R = ρ * l / S = 0.018 * 2 / 0.5 = 0.072 Ohm.
Answer: The resistance of the copper wire is 0.072 ohm.