Ohmic conductors follow Ohm's law, where resistance remains constant regardless of voltage and current. Non-ohmic conductors have resistance that chan
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What is the difference between ohmic and non-ohmic conductors?
Ohmic conductors obey Ohm’s law — current is directly proportional to voltage and the V–I graph is a straight line (e.g. metals like copper). Non-ohmic conductors do not obey Ohm’s law and their V–I graph is not a straight line (e.g. a diode or a filament bulb).
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Give examples of ohmic and non-ohmic conductors.
Ohmic: copper wire and most metallic conductors at constant temperature. Non-ohmic: a semiconductor diode, LED, filament lamp and transistor.
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What does the V–I graph look like for each?
For an ohmic conductor the graph of voltage against current is a straight line through the origin. For a non-ohmic conductor the graph is curved or non-linear.
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