Constantan wire resistance 2.5 Ohm, cross-sectional area 2mm2. How long is the wire?
July 28, 2021 | education|
To calculate the length of the taken constantan wire, we will use the formula: R = ρ * l / S, from where we express: l = R * S / ρ.
Constants and variables: R – resistance of the taken constantan wire (R = 2.5 Ohm); S – cross-sectional area (S = 2 mm2); ρ – specific electrical resistance of constantan (at a temperature of 20 ºС ρ = 0.5 Ohm * mm2 / m).
Let’s perform the calculation: l = R * S / ρ = 2.5 * 2 / 0.5 = 10 m.
Answer: The taken constantan wire must have a length of 10 m.
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