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GCSE Physics · key term
A conductor for which current is directly proportional to potential difference when its temperature is constant.
Used by AQA, Edexcel and OCR
Specification 4.2.1.4 · Paper 1
Revise: Ohmic and Non-Ohmic Circuit ElementsAn ohmic conductor obeys a particular relationship: at constant temperature, its current is directly proportional to the potential difference across it.
Specification 10.18 · Paper 2
A component for which current is directly proportional to potential difference, so its current–potential difference graph is a straight line through the origin.
Revise: V-I CharacteristicsThe fixed resistor is an ohmic conductor with constant resistance, whereas the lamp is non-ohmic because heating changes its resistance.
Specification P3.2e, P3.2g · Paper 1 (Foundation), Paper 3 (Higher)
A conductor whose resistance remains constant as potential difference and current change, provided its temperature stays constant.
A conductor that has constant resistance when its temperature and other physical conditions remain constant.
Paper 1, Paper 2
A conductor for which current is directly proportional to potential difference when physical conditions, especially temperature, remain constant.
Revise: Investigating I-V Characteristics of ComponentsA fixed resistor at constant temperature is an ohmic conductor. Its I–V characteristic is a straight line through the origin: doubling the potential difference doubles the current.
Include the qualification at constant temperature when stating the relationship for an ohmic conductor.
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