Cross-section 71254

The steel conductors of the long-distance power line have a cross-section of 5 cm2. Calculate the resistance of a steel wire with a length of 2 km if the resistivity of the steel is 13 * 10-8 Ω · m.

Correct answer:

R =  0.52 Ω

Step-by-step explanation:

S=5 cm2 m2=5:10000  m2=0.0005 m2 l=2 km m=2 1000  m=2000 m ρ=13 1081.3107 Ω  R=ρ Sl=1.3107 0.00052000=2513 Ω=0.52 Ω

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