Question

A 3 km long AWG-6 metallic wire has a resistance of approximately 6Ω at 20 °C. What material is it made of?

Answer 1

material is aluminum by the approx value of conductivity

Step-by-step explanation:

given data

length = 3 km

temperature = 20 °C

metallic wire = AWG-6

resistance = 6Ω

to find out

What material is it made of

solution

we know that AWG - 6 has a diameter of 4.1 mm

so we know resistance R is

R =
`(l)/(\sigma A)`

here A is area and R is resistance and l is length so find here σ

σ =
`(l)/(R A)`

σ =
`(3*10^3)/(6*\pi ((4.1)/(2) )^2)`

σ = 3.79 ×
`10^(7)` S/m

so according to table 2-1

material is aluminum by the approx value of conductivity