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jennychan12

  • 2 years ago

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?

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  1. jennychan12
    • 2 years ago
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    \[V = IR\] \[P = IV\] \[R = \frac{ \delta L }{ A }\] i used the first one (R=V/I) is that right?

  2. jennychan12
    • 2 years ago
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    and you're not given the constant.

  3. modphysnoob
    • 2 years ago
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    so first find the resistance

  4. jennychan12
    • 2 years ago
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    yeah i got that 12 ohms

  5. jennychan12
    • 2 years ago
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    using the first formula right?

  6. modphysnoob
    • 2 years ago
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    yes

  7. jennychan12
    • 2 years ago
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    that's it? but what are the length and diameter given for?

  8. modphysnoob
    • 2 years ago
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    once you find R , use that and given diameter and length to find resistivity which is \[\delta\]

  9. jennychan12
    • 2 years ago
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    -_- grr. i thought the R was the resistivity.. fdjsalkfhdjkshfklhg got that question wrong on the quiz >:(

  10. jennychan12
    • 2 years ago
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    thanks tho. :)

  11. modphysnoob
    • 2 years ago
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    R is resistance

  12. jennychan12
    • 2 years ago
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    oh okay. my teacher didn't explain clearly. :(

  13. modphysnoob
    • 2 years ago
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    well, you know now, will help you in future exam

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