Physics path · GCSE Physics

Why does a lantern filament stop behaving proportionally?

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Practice question

A camping lantern uses a filament lamp. On its dim setting, the potential difference is 1.0 V and the current is 0.20 A. On its bright setting, the filament is hotter, the potential difference is 3.0 V and the current is 0.40 A. Explain what the readings show about direct proportionality and how the resistance changes as the filament heats.

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Official curriculum

4.2.1.4 Ohmic and non-ohmic resistor behaviour

This challenge practises knowledge and exam skills from the official GCSE science curriculum. Use these sources to see the exact subject content and its wider Key Stage 4 context.

AQA specification 4.2.1.4 Ohmic and non-ohmic resistor behaviour GOV.UK Key Stage 4 science programme

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