Calculate the resistance of a copper overhead wire 5 km long and a cross-sectional area of 0.65 cm2.
| February 19, 2021 | education
Initial data: l (length of copper contact wire) = 5 km = 5000 m; S (cross-sectional area of the contact wire) = 0.65 cm2 = 65 mm2.
Reference values: ρ (resistivity of copper, 20 ºС) = 0.017 Ohm * mm2 / m.
We calculate the resistance of the copper contact wire by the formula: R = ρ * l / S.
Let’s make the calculations: R = 0.017 * 5000/65 = 1.3 Ohm.
Answer: The resistance of the copper contact wire with the given parameters is 1.3 ohms.
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