Constantan wire resistance 2.5 ohm, cross-sectional area 2mm2.
| May 8, 2021 | education
Constantan wire resistance 2.5 ohm, cross-sectional area 2mm2. What is the length of the wire, the specific resistance is constantan 0.5 Ohm * mm2 / m.
Initial data: R (resistance of the taken constantan wire) = 2.5 Ohm; S (cross-sectional area of the wire) = 2 mm2.
Reference values: ρ (constantan resistivity) = 0.5 Ohm * mm2 / m.
We express the length of the constantan wire from the formula: R = ρ * l / S and l = R * S / ρ.
Calculation: l = 2.5 * 2 / 0.5 = 10 m.
Answer: The length of the constantan wire is 10 meters.
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