calculation

[larry conn]

a conductor of 117 feet in length and 980 sq mils in cross sectional area has a resistance of 1 ohm
What is the resistance of 1987 feet of wire of 9862 sq mils of cross sectional area

This was a state exam question

 

[charlie b]

What answer did you give? We generally don't just give out information, unless we have some reason to believe that the person asking the question has put some effort into solving it yourself. So please tell us what you know, or don't know, about the subject, where you looked for possible answers, and how you think the problem should be approached.

 

[petersonra]

my answer is "B".

 

[Ingenieur]

a conductor of 117 feet in length and 980 sq mils in cross sectional area has a resistance of 1 ohm
What is the resistance of 1987 feet of wire of 9862 sq mils of cross sectional area

This was a state exam question

R = p x L/A

use ratios
use 1 for p

hints
if 10 times as long 10 times the R
if 10 times the area 1/10 times the R

 

[topgone]

1.687 ohms.

 

[junkhound]

1.687 ohms.

1.688, you rounded incorrectly :lol:

Part 2: What are the respective gauges and the temperature ?

 

[Tony S]

1.6876138575991

 

[Ingenieur]

R = p x L/A

use ratios
use 1 for p

hints
if 10 times as long 10 times the R
if 10 times the area 1/10 times the R

1 x (1987/117) x (1/(9862/980)) = 1.6876...or there abouts