In response to TriggerNum5 & Ratch...
You're both correct, kind of. I believe you are getting confused between RESISTANCE and RESISTIVITY.
It is actually Resistivity that you are referring to, which is a material property and therefore defines an Ohmic material. Resistivity is a function, but not of V or I, so is therefore independent from them.
Resistivity (K), or rather Conductivity (1/K), is a ratio of the electric field (Newtons per Coulomb) and the current density (J, or Amps per Square Metre). This value is determined by the number of free charge carriers (i.e; electrons) a material has. For copper, this number is high, as one would expect as it is a great conductor. For an insulator, such as Teflon, the number of charge carriers is low. For a semiconductor, the number of charge carriers is determined by the materials exposure to an external electric field.
Getting down into the real physics of it, it is more related to component design (ie, FETs).
You're both correct, kind of. I believe you are getting confused between RESISTANCE and RESISTIVITY.
It is actually Resistivity that you are referring to, which is a material property and therefore defines an Ohmic material. Resistivity is a function, but not of V or I, so is therefore independent from them.
Resistivity (K), or rather Conductivity (1/K), is a ratio of the electric field (Newtons per Coulomb) and the current density (J, or Amps per Square Metre). This value is determined by the number of free charge carriers (i.e; electrons) a material has. For copper, this number is high, as one would expect as it is a great conductor. For an insulator, such as Teflon, the number of charge carriers is low. For a semiconductor, the number of charge carriers is determined by the materials exposure to an external electric field.
Getting down into the real physics of it, it is more related to component design (ie, FETs).