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?
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jennychan12
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\[V = IR\]
\[P = IV\]
\[R = \frac{ \delta L }{ A }\]
i used the first one (R=V/I)
is that right?
jennychan12
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and you're not given the constant.
modphysnoob
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so first find the resistance
jennychan12
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yeah i got that 12 ohms
jennychan12
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using the first formula right?
modphysnoob
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yes
jennychan12
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that's it?
but what are the length and diameter given for?
modphysnoob
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once you find R , use that and given diameter and length to find resistivity which is
\[\delta\]
jennychan12
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-_-
grr. i thought the R was the resistivity..
fdjsalkfhdjkshfklhg
got that question wrong on the quiz >:(
jennychan12
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thanks tho. :)
modphysnoob
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R is resistance
jennychan12
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oh okay. my teacher didn't explain clearly. :(
modphysnoob
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well, you know now, will help you in future exam