Find the resistivity constant homework

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Homework Help Overview

The problem involves calculating the conductance of a device based on given current and voltage values, while also referencing the resistivity constant in relation to resistance and geometry.

Discussion Character

  • Conceptual clarification, Problem interpretation

Approaches and Questions Raised

  • The original poster attempts to calculate resistance and then relates it to conductance, but expresses confusion about the need for the resistivity constant without having the length and area. Some participants question the necessity of the resistivity constant for finding conductance, suggesting that the focus should remain on the relationship defined in the problem.

Discussion Status

The discussion is exploring the relationship between conductance and resistance, with some participants clarifying the definitions involved. There is a recognition of misunderstanding from the original poster regarding the question's requirements.

Contextual Notes

The original poster lacks information on the length and area needed to apply the resistivity formula, which contributes to their confusion about the resistivity constant's relevance.

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Homework Statement


The conductance G of a device is defined to be the inverse of its resistance, G=1/R. What is the conductance of a device through which the current is 2 A when a potential difference of 60 V is applied?


Homework Equations


R= V/I
R= (resistivity)X (length)/Area


The Attempt at a Solution


I first found the resistance by using the first equation, and got 30 ohms but then I get stuck...because I don't see any other formulas that that uses resistance that allows me to find the resistivity constant...and I don't have the length and area for the second equation..
 
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Why do you need the resistivity constant? Don't you just need to find the conductance, which is 1/R?
 


ideasrule said:
Why do you need the resistivity constant? Don't you just need to find the conductance, which is 1/R?
but don't i need the resistivity constant to find that to do find the conductance?
 


The conductance is defined in the question as 1/R, where R is resistance.
 


ideasrule said:
The conductance is defined in the question as 1/R, where R is resistance.

Ohh! I'm so stupid I didn't even read the question properly...
Thanks for clearing things up
 

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