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Current-Voltage Graphs


For a filament lamp for small voltages the current is proportional to the potential difference and the filament lamp acts as an ohmic conductor.At higher voltages the current increases and the wire heats up.The resistance increases as the positive ions in the metal lattice vibrate more, so the electrons collide with them more often.

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Specification: Edexcel Physics (8PH0), AS-level, Topic 3: Electric Circuits, statement 38. Topic: Electrical Quantities.

Key terms in this lesson

ohmic conductor
A component whose current is directly proportional to the potential difference across it at constant temperature.

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