What is the length of a copper wire using a 0.2mm² cross-section if its resistance is 17Ω?
| May 2, 2021 | education
Initial data: S (cross-sectional area of the taken copper wire) = 0.2 mm2; R (wire resistance) = 17 ohms.
Reference data: ρ (specific electrical resistance of copper) = 0.017 Ohm * mm2 / m.
The length of the copper wire is determined from the formula for calculating the resistance: R = ρ * l / S, whence l = R * S / ρ.
Calculation: l = 17 * 0.2 / 0.017 = 200 m.
Answer: The length of the copper wire is 200 meters.
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