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?

Question

jennychan12 · Answer

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

jennychan12 · Answer

and you're not given the constant.

anonymous · Answer

so first find the resistance

jennychan12 · Answer

yeah i got that 12 ohms

jennychan12 · Answer

using the first formula right?

anonymous · Answer

yes

jennychan12 · Answer

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

anonymous · Answer

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

jennychan12 · Answer

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

jennychan12 · Answer

thanks tho. :)

anonymous · Answer

R is resistance

jennychan12 · Answer

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

anonymous · Answer

well, you know now, will help you in future exam