Solved

is carbon ohmic

Posted on 2016-09-25
8
38 Views
Last Modified: 2016-10-14
my ques is simple!! please let me know if carbon is ohmic or non ohmic conductor??
0
Comment
Question by:charanjit singh
8 Comments
 
LVL 26

Accepted Solution

by:
Dr. Klahn earned 167 total points (awarded by participants)
ID: 41814596
In its normal, non-crystalline room-temperature state, carbon is -- for all practical purposes -- ohmic.  That is why carbon resistors are the norm in electrical circuits.

In theory there can be carbon-based semiconductors.  However, in practice crystalline carbon is called diamond, and we do not yet have the technology to make diamonds of that purity and size.  Man-made diamonds are generally contaminated to some extent with nitrogen.
0
 
LVL 93

Assisted Solution

by:John Hurst
John Hurst earned 166 total points (awarded by participants)
ID: 41814691
Carbon is a very decent conductor used in many electronic applications. Many ordinary resistors are made out of carbon and carry electric current well and in accordance with Ohm's Law.

So as you express it: ohmic.
0
 
LVL 32

Assisted Solution

by:phoffric
phoffric earned 167 total points (awarded by participants)
ID: 41814776
As far as crushed carbon powder is concerned, it depends on how well packed it is within its container. If loosely packed, then the smallest vibration affects its resistivity. For example, if you loosely pack carbon powder in a tiny tube, and connect a write to one end and aluminum foil with an attached wire to the other end, and connect the wires to an amplifier, then when you speak in the direction of the foil, the sound waves cause small pressure differences on the carbon effectively changing its resistance. The net result is that you have a carbon based microphone.
0
Free Tool: Port Scanner

Check which ports are open to the outside world. Helps make sure that your firewall rules are working as intended.

One of a set of tools we are providing to everyone as a way of saying thank you for being a part of the community.

 
LVL 32

Expert Comment

by:phoffric
ID: 41814779
For store bought resistor that are carbon based, they are ohmic within some maximum voltage at room temperature. Exceeding that voltage results in too high temperature which results in non ohmic behavior.
0
 
LVL 32

Expert Comment

by:phoffric
ID: 41814782
Also, I believe that carbon nanotubes may not be ohmic, but I am not certain about that.
0
 
LVL 27

Expert Comment

by:d-glitch
ID: 41814791
Your question is not really so simple.
Diamond (natural and artificial) are still carbon and are not panic.

And the production of industrial diamonds has advanced enormously.
     https://en.m.wikipedia.org/wiki/Synthetic_diamond

It is possible to grow CVD sheets up to 10 cm in diameter.  
     http://www.seocal.com/seki_products_results.html#5000
0
 
LVL 93

Expert Comment

by:John Hurst
ID: 41814862
In more or less standard electronic / electric carbon use, it responds properly to Ohm's Law.
0
 
LVL 93

Expert Comment

by:John Hurst
ID: 41843340
Question was answered
0

Featured Post

Announcing the Most Valuable Experts of 2016

MVEs are more concerned with the satisfaction of those they help than with the considerable points they can earn. They are the types of people you feel privileged to call colleagues. Join us in honoring this amazing group of Experts.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Suggested Solutions

Title # Comments Views Activity
Roulette strategy probability question 58 109
Vertical and Horizontal Shift 4 128
My 2003 Land Rover discovery 2 key for code for car alarm 7 132
Triangles - Calculating angles 7 66
A Guide to the PMT, FV, IPMT and PPMT Functions In MS Excel we have the PMT, FV, IPMT and PPMT functions, which do a fantastic job for interest rate calculations.  But what if you don't have Excel ? This article is for programmers looking to re…
When we purchase storage, we typically are advertised storage of 500GB, 1TB, 2TB and so on. However, when you actually install it into your computer, your 500GB HDD will actually show up as 465GB. Why? It has to do with the way people and computers…
Although Jacob Bernoulli (1654-1705) has been credited as the creator of "Binomial Distribution Table", Gottfried Leibniz (1646-1716) did his dissertation on the subject in 1666; Leibniz you may recall is the co-inventor of "Calculus" and beat Isaac…
Finds all prime numbers in a range requested and places them in a public primes() array. I've demostrated a template size of 30 (2 * 3 * 5) but larger templates can be built such 210  (2 * 3 * 5 * 7) or 2310  (2 * 3 * 5 * 7 * 11). The larger templa…

808 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question