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jpuppy21
Joined: 11 Mar 2010 Posts: 1 Location: Home

Posted: Thu Mar 11, 2010 9:26 pm Post subject: Resistance/Resistor 


If a 30 Amp Circuit is used, what is the length of 10guage copper wire with an area of 5.0mm^2 needed for the 30 Amp current?
I have found that the resistivity of copper is 1.7 E8 Ωm.
I know the equation I need to use is Resistance = Resistivity*(Lenght/Area) (I think) but where would I find the resistance for the equation?
I also know that Resistance=Voltage/Current
I just dont understand how to get this question done. Any help would be appreciated!!! 

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hepcj Site Admin
Joined: 23 Jun 2007 Posts: 125

Posted: Fri Mar 12, 2010 1:32 pm Post subject: 


Are you sure this is the only information given in the question? As it is, there is not enough information to calculate the length. 

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