Question

which device does not obey ohms law​

Answer 1

Answer:

Such devices are termed non-linear and do not obey Ohm's law. Examples include filament lamps, diodes and thermistors. The resistance of a non ohmic device may vary with time. Electrical resistance is a consequence of electrons colliding with ions and losing mechanical energy.

Answer 2

Devices with non-linear circuits do not obey ohm's law​.

Ohm's law states, "At constant physical conditions, the electric current flowing through the conductor is directly proportional to the potential difference(p.d) across its two ends".

If V is the p.d across the conductor and I is the current flowing through it. The formula for ohm|s law is,

                                              V=IR

Examples of devices that do not obey Ohm's law are resistors, diodes, capacitors, etc. Such types of devices are also called non-ohmic devices.

The value of resistance(R) changes in non-ohmic devices as the voltage-current is changed in non-ohmic devices. When the graph is plotted between voltage and current, a linear line is not obtained.

Hence, those materials do not obey Ohm's law.