Is it possible for something to be a perfect ohmic conductor?
I did an experiment at school and recorded volts and amps using a resistor with a specific ohm rating. No recorded result is an ohmic conductor. Why is this? Is it because the circuit isn't efficient or is it just fault on my part?
I did an experiment at school and recorded volts and amps using a resistor with a specific ohm rating. No recorded result is an ohmic conductor. Why is this? Is it because the circuit isn't efficient or is it just fault on my part?
1 Answer
Yes, that's called a Superconductor.
No, you probably didn't create one.
Explanation:
Certain materials will exhibit zero resistance when cooled to very low temperatures. This is called superconductivity. MRI magnets use this technology to keep very strong magnetic fields running at all times using an electro magnet. These magnets are generally cooled to near absolute zero with liquid helium.
In your experiment, it seems more likely that the meter you used is not precise enough to measure the unknown resistance. A better meter or a wheatstone bridge can be used to measure very tiny resistances.
