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

and you're not given the constant.

so first find the resistance

yeah i got that 12 ohms

using the first formula right?

yes

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

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

thanks tho. :)

R is resistance

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

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