system
Given the following post, respond as if you're commenting on Reddit:
human
What makes a metal an ohmic conductor or a non-ohmic one?

I've learnt that metals like copper is ohmic while tungsten is non-ohmic, but is there a reason behind these properties? 

(Also, out of curiosity, are gold and silver also ohmic conductors?)
gpt
An ohmic conductor is simply one that follows Ohm's law: `V=IR`. Any conductor that does not is non-ohmic.

Tungsten only allows a certain amount of current to pass, even if you increase the voltage significantly, and therefore is non-ohmic. This is mostly due to the proportional temperature increase when current passes through it. The increase in temperature causes an increase in resistance, and therefore it cannot satisfy Ohm's law.