jennychan12
  • jennychan12
Circuits: A certain material has a voltage of 120 V across 10 A and the length of the wire is 25 m, while the diameter is 5 mm. What it its resistivity?
Physics
  • Stacey Warren - Expert brainly.com
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SOLVED
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jamiebookeater
  • jamiebookeater
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jennychan12
  • jennychan12
\[V = IR\] \[P = IV\] \[R = \frac{ \delta L }{ A }\] i used the first one (R=V/I) is that right?
jennychan12
  • jennychan12
and you're not given the constant.
anonymous
  • anonymous
so first find the resistance

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jennychan12
  • jennychan12
yeah i got that 12 ohms
jennychan12
  • jennychan12
using the first formula right?
anonymous
  • anonymous
yes
jennychan12
  • jennychan12
that's it? but what are the length and diameter given for?
anonymous
  • anonymous
once you find R , use that and given diameter and length to find resistivity which is \[\delta\]
jennychan12
  • jennychan12
-_- grr. i thought the R was the resistivity.. fdjsalkfhdjkshfklhg got that question wrong on the quiz >:(
jennychan12
  • jennychan12
thanks tho. :)
anonymous
  • anonymous
R is resistance
jennychan12
  • jennychan12
oh okay. my teacher didn't explain clearly. :(
anonymous
  • anonymous
well, you know now, will help you in future exam

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