Question

If a 250-foot #12 copper conductor has a resistance of 0.397 ?, how much is the resistance of the same conductor at 800 feet

Answer 1

Answer: 1.2704 ohm

Step-by-step explanation:

Since resistance is directly proportional to the length of the conductor.

Let x be the resistance of the same conductor at 800 feet.

Then by direct proportion,

$\frac{x}{800}=\frac{0.397}{250}\\\Rightarrow\ x=\frac{0.397\times800}{250}\\\Rightarrow\ x=1.2704$

hence, the resistance of same conductor at 800 feet = 1.2704 ohm