also define ohmic and non ohmic substance
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Ohmic substance: That substance which obeys ohm's law. The resistance of substance does not depends upon current and voltage. For example:wire , resistor. Wire is ohmic substance because it obeys ohm;s law. Non- ohmic subtance: That substance which does not obeys ohm's law
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The substances which obey ohms law are known as ohmic substance and that do not obey ohms law are called non-ohmic substances. Conductors like copper is an example for ohmic conductor and semiconductor are the example for nonohmic substance