is a range of voltages over which the resistance is fairly constant.
dissipation of heat, the resistance is heated and its resistance changes.
resistance does not obey near the breakdown voltage of the materials. The
materials become super conductors at very high voltages.
materials do not obey ohm's law below a certain temperature.
resistors only follow ohm’s law.
Non-ohmic resistors like diodes, semi-conductors or insulators, do not
obey ohm’s law.
depends on the temperature. It increases
is also altered, there is a presence of magnetic field or electric field, if
that induces an emf in the conductor.
That is, if there is an electromagnetic interference effect.
conductor or resistor has an inherent capacitance and inductance. That could depend on the geometrical shapes
too. It is not a pure resistance.
For gases and liquids, the law is perhaps not
valid exactly. For ionic substances, the law may be invalid exactly.