Exam-style question
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Describe how the resistance of a filament lamp changes with increasing temperature and how this affects its I-V characteristic.
Model answer
What a good answer should say
- As the temperature of a filament lamp increases due to the flow of current, its resistance also increases.
- This results in a non-linear I-V characteristic where the current does not increase proportionally with the potential difference, leading to a curve in the graph rather than a straight line.
Explanation
Why this works
This answer highlights the relationship between temperature and resistance in filament lamps, demonstrating an understanding of how these factors influence the I-V characteristic, which is essential for grasping the behavior of non-ohmic conductors.
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