## jennychan12 Group Title 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? one year ago one year ago

1. jennychan12 Group Title

$V = IR$ $P = IV$ $R = \frac{ \delta L }{ A }$ i used the first one (R=V/I) is that right?

2. jennychan12 Group Title

and you're not given the constant.

3. modphysnoob Group Title

so first find the resistance

4. jennychan12 Group Title

yeah i got that 12 ohms

5. jennychan12 Group Title

using the first formula right?

6. modphysnoob Group Title

yes

7. jennychan12 Group Title

that's it? but what are the length and diameter given for?

8. modphysnoob Group Title

once you find R , use that and given diameter and length to find resistivity which is $\delta$

9. jennychan12 Group Title

-_- grr. i thought the R was the resistivity.. fdjsalkfhdjkshfklhg got that question wrong on the quiz >:(

10. jennychan12 Group Title

thanks tho. :)

11. modphysnoob Group Title

R is resistance

12. jennychan12 Group Title

oh okay. my teacher didn't explain clearly. :(

13. modphysnoob Group Title