A technician in a research laboratory in Kenya measures the current-potential difference characteristics of a filament lamp. Which statement correctly describes the resistance of the filament lamp as the potential difference increases?

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Question

A technician in a research laboratory in Kenya measures the current-potential difference characteristics of a filament lamp. Which statement correctly describes the resistance of the filament lamp as the potential difference increases?

Accepted Answer

The resistance increases because the temperature of the filament increases. — Award 1 mark for identifying that the filament lamp is a non-ohmic conductor and that increased current causes increased temperature, which increases resistance. A is incorrect — a filament lamp is non-ohmic. B is incorrect — temperature increases, not decreases. D is incorrect — increased electron flow does not cause decreased resistance in metals.

Answer

The resistance increases because the temperature of the filament increases.

Answer

The resistance decreases because more electrons flow through the filament.

Answer

The resistance remains constant because the lamp is an ohmic conductor.

Answer

The resistance decreases because the temperature of the filament decreases.

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