Question

What is the resistance of a 1000 m long copper wire with a 1 × 10-6 m² (1 mm²) cross-section assuming copper's resistivity is 1.68 × 10-8 Ω·m? Answer in the form: ##.#

Answer 1

`R=16.8`Ω

Step-by-step explanation:

l=1000m

a=1mm2

p=1.68x10^-8

Electrical Resistivity Equation

`R=p((L)/(A) )\\`

where

p= proportional constant ρ (the Greek letter “rho”) is known as Resistivity.

L = is the length in metres (m)

A= is the area in square metres (m2),

R=1.68×10^-8×(1000/1×10^-6)

`R=16.8`Ω