A student investigates how current varies with potential difference for a filament lamp. Which statement correctly describes the relationship observed?

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Question

A student investigates how current varies with potential difference for a filament lamp. Which statement correctly describes the relationship observed?

Accepted Answer

Current increases at a decreasing rate as potential difference increases — Award 1 mark for recognising the non-linear relationship. As the filament heats up, its resistance increases, so current does not increase proportionally with p.d. A is incorrect — this would only apply to an ohmic conductor at constant temperature. C is incorrect — current increases, not decreases. D is incorrect — current does change with p.d.

Answer

Current increases at a decreasing rate as potential difference increases

Answer

Current decreases as potential difference increases

Answer

Current is directly proportional to potential difference

Answer

Current remains constant as potential difference increases

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