Resistivity of Copper Wire

  • Thread starter Snape1830
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12-gauge copper wire has a radius of 1.03×10−3 m. (a) What is the resistance of 11.5 m of this wire at 20°C. (b) How much current will pass through the wire if a potential difference of 9.00 V is applied across it?
The resistivity for copper is 1.7E-8 ohm meters
For part a:
The equation is R=ρ(L/A) and A=∏r2.
I solved for Area and got 3.33E-6 m2.
Then I did R=1.7E-8(11.5/3.33E-6)
R=.0587 ohms.

However, when I plug this into the system it says it's wrong. What did I do incorrectly? I double-checked my multiplication and everything.
 

Answers and Replies

  • #2
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Never mind, it was sig figs
 

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