What is the electrical resistance of a copper cable 100 m long with a cross-sectional area of 0.25 mm2?

univerkov | July 25, 2021 | education

Task data: l (length of the taken copper cable) = 100 m; S (cable cross-sectional area) = 0.25 mm2.

Reference values: ρ (electrical resistivity of copper at 20 ºС) = 0.017 Ohm * mm2 / m.

The required electrical resistance of the taken copper cable is calculated by the formula: R = ρ * l / S.

Let’s make a calculation: R = 0.017 * 100 / 0.25 = 6.8 Ohm.

Answer: The copper cable taken has an electrical resistance of 6.8 ohms.

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