Register to reply

Conductivity.. homework problem help

by weston_sagle
Tags: conductivity
Share this thread:
Nov7-09, 08:50 PM
P: 5
1. The problem statement, all variables and given/known data
At what temperature does a carbon resistor have a resistance of 995 ohms, if it has a resistance of 1000 ohms at 20 degrees? What is its conductivity at the new temperature?

2. Relevant equations

3. The attempt at a solution
I don't even know where to start.
Phys.Org News Partner Science news on
'Smart material' chin strap harvests energy from chewing
King Richard III died painfully on battlefield
Capturing ancient Maya sites from both a rat's and a 'bat's eye view'
Nov7-09, 09:57 PM
P: 539
Do you have any equations that relate the change of some property (e.g. resistivity) of a conductor with temperature changes?
Nov7-09, 10:13 PM
P: 5
Well, the situation isn't ideal. We recently got a new teacher, after our old teacher canceled 2 weeks of classes. Now we are trying to catch up so we have an assignment on material we haven't covered. I also have no textbook for the class. I did google searches but could only find R= conductivity*L/A but I don't have length or area.

Nov7-09, 10:55 PM
P: 539
Conductivity.. homework problem help

Check out this link then:

Then think about the connections between resistance, resistivity, and conductivity.

I don't understand why there is no text for the course. Is this a college-level course? There are many older editions of quality texts that you can get dirt cheap through, for example.

Also, the equation you quoted in your previous post should have "conductivity" replaced with "resistivity", according to one of my texts.

Register to reply

Related Discussions
Conductivity of solutions Biology, Chemistry & Other Homework 23
Conductivity of Ne Atomic, Solid State, Comp. Physics 6
Conductivity physics homework Advanced Physics Homework 4
Find thermal conductivity of metal in a rod Introductory Physics Homework 0