Question

What are ohmic and non-ohmic devices? Give examples.

Answer 1

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What are ohmic and non-ohmic devices?

Answer:
As we know that,

Ohm’s law states that‘The current flowing through a conductor is directly proportional to the potential difference V across its ends, provided the temperature and physical conditions of the conductor remain the same’.

Hence,

The device which follows ohm's law for all voltages across it is called as an ohmic device.(i.e under constant physical conditions such as temperature, the resistance is constant for all currents that pass through it).

Examples of ohmic devices are : a wire, heating element or a resistor.

The device that does not follow ohm's law is known as a non-ohmic device (i.e the resistance is different for different currents passing through it).

Examples of non ohmic devices are: thermistors, crystal rectifiers, vacuum tube etc.
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Answer 2

Answer:

OHMIC DEVICES:-

The ohmic devices are those which follows Ohm's law or we can say that the devices whose resistance value remain constant.

Ex:- Heater, windings in machines, silicon crystals, battery, chargers, LDR’s, potentiometer, transmission lines etc.,

NON-OHMIC DEVICES:-

The Non-Ohmic devices are those which do not follow the Ohm's law.

Ex:-Thermisters, Vacuum tube, tungsten filament, crystal resifiers, etc.,