Diameter and resistance

  • Thread starter phy112
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  • #1
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Homework Statement



If 46 m of nichrome wire is to have a resistance of 12.0 Ω at 20°C, what diameter wire should be used?

Homework Equations



R=[tex]\rho[/tex](L/A)

The Attempt at a Solution



I tried and I got 2.1. The [tex]\rho[/tex] of nichrome is 108e-8
 

Answers and Replies

  • #2
28
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First solve for the variable you are looking for and put it on one side. Keep your knowns on the other side. Remember that A stands for area, and area is related to wire diameter.

I am online for a bit, so give it a go. DON'T FORGET YOU UNITS!
 
  • #3
37
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ok yeah i got 2.3 mm. after i figured out A. I figured out diameter doing A=1/4pi(dsquared)
 
  • #4
37
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ok i got it right. thanks!
 
  • #5
28
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Good for you!
 

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