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is carbon ohmic

Posted on 2016-09-25
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my ques is simple!! please let me know if carbon is ohmic or non ohmic conductor??
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Question by:charanjit singh
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Dr. Klahn earned 668 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.
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by:John Hurst
John Hurst earned 664 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.
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by:phoffric
phoffric earned 668 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.
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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.
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by:phoffric
ID: 41814782
Also, I believe that carbon nanotubes may not be ohmic, but I am not certain about that.
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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
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by:John Hurst
ID: 41814862
In more or less standard electronic / electric carbon use, it responds properly to Ohm's Law.
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by:John Hurst
ID: 41843340
Question was answered
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