(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

A conductor has cross-section of 10 cm2 and specific resistance of 7.5 ohm cm at 0 degree C

what will be its resistance in ohm per/kilometer when the temperature is 40 degree C ?

take temperature co-efficient of the material is 0.005 / degree C

i cant find the solution of it. please give me solution if you can

please help me

2. Relevant equations

Resistance of a wire in Ω

R = ρL/A

ρ is resistivity of the material in Ω-cm

L is length in cm

A is cross-sectional area in cm²

3. The attempt at a solution

R = (7.5 Ω-cm)(L) / 10 cm²

R/L = 0.75 Ω/cm

R/L = 0.75 Ω/cm x 100000 cm/km = 75000 Ω/km

R/L = 75000 Ω/km x [1+ (0.005/C)*40C]

R/L = 90000 Ω/km

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# Homework Help: Resistance and temp co-efficient?

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