Coursework - Determining Resistivity

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Homework Help Overview

The discussion revolves around determining the resistivity (ρ) of nichrome wire in a laboratory experiment. The original poster has derived a relationship involving resistivity, area (A), and voltage (V), but is encountering difficulties with the units and the resulting value.

Discussion Character

  • Exploratory, Assumption checking

Approaches and Questions Raised

  • The original poster attempts to clarify the variables involved in their equation, specifically questioning the units of area and the implications of using millimeters instead of meters. Some participants inquire about the definitions of the variables and the significance of the wire gauge (28 swg).

Discussion Status

The discussion is ongoing, with participants seeking clarification on the original poster's question and the variables involved. There is a suggestion for the original poster to rephrase their question using a provided template, indicating a desire for clearer communication.

Contextual Notes

There is mention of the original poster's confusion regarding unit conversion, specifically the need to convert area from millimeters to meters, which may affect the calculated resistivity. The use of nichrome wire and its gauge is also noted as potentially relevant to the problem.

coolnufc
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Hi guys, I am trying to work out ρ in an experiment.

Ive got down to ρ/AxV = 6.4
I know V = 2 and A=0.0907mm, but it should be m.

If i then work it out i get a stupidly small answer. Anyone help me out. Its like 0.0016096
 
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It was nichrome wire (28 swg) i was using if that helps
 
So, what's the problem?
What is A, x and V? Why should it be m?
What does 28swg mean?
 
coolnufc said:
Hi guys, I am trying to work out ρ in an experiment.

Ive got down to ρ/AxV = 6.4
I know V = 2 and A=0.0907mm, but it should be m.

If i then work it out i get a stupidly small answer. Anyone help me out. Its like 0.0016096

I agree with Engineer -- you need to be much clearer in your question. It would have helped if you had used the Homework Help Template that you are provided when you start a new homework thread. Please try to re-phrase your question in the form of the template:

 

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