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diameter and resistance |
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| Feb14-09, 05:34 PM | #1 |
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diameter and resistance
1. The problem statement, all variables and given/known data
If 46 m of nichrome wire is to have a resistance of 12.0 Ω at 20°C, what diameter wire should be used? 2. Relevant equations R=[tex]\rho[/tex](L/A) 3. The attempt at a solution I tried and I got 2.1. The [tex]\rho[/tex] of nichrome is 108e-8 |
| Feb14-09, 05:40 PM | #2 |
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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! |
| Feb14-09, 05:52 PM | #3 |
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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)
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| Feb14-09, 05:59 PM | #4 |
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diameter and resistance
ok i got it right. thanks!
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| Feb14-09, 06:11 PM | #5 |
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Good for you!
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