Q4. Give an example of non-ohmic substance.
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Liquid electrolytes, vacuum tubes, junction diodes, thermistors etc.
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Answer:
Non - Ohmic conductor does not obey ohm's law. Semiconductors and insulators are non Ohmic substances.
Devices like diode, transistor is made of semiconductors like silicon, germanium and they don't follow the Ohm' Law.
There are a number of examples of non-Ohmic conductors : including bulb filaments and semiconductors like diodes and transistors.
A diode provides a near constant voltage drop even if you vary the current, so it does not follow Ohm's law.
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