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is carbon ohmic

my ques is simple!! please let me know if carbon is ohmic or non ohmic conductor??
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charanjit singh
Asked:
charanjit singh
3 Solutions
 
Dr. KlahnPrincipal Software EngineerCommented:
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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John HurstBusiness Consultant (Owner)Commented:
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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phoffricCommented:
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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phoffricCommented:
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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phoffricCommented:
Also, I believe that carbon nanotubes may not be ohmic, but I am not certain about that.
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d-glitchCommented:
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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John HurstBusiness Consultant (Owner)Commented:
In more or less standard electronic / electric carbon use, it responds properly to Ohm's Law.
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John HurstBusiness Consultant (Owner)Commented:
Question was answered
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