Exam-style question
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Explain the I-V characteristic of a filament lamp, including how it differs from an ohmic conductor.
Model answer
What a good answer should say
- The I-V characteristic of a filament lamp shows a non-linear relationship between current and potential difference.
- As the current increases, the temperature of the filament rises, leading to an increase in resistance, which is why the graph curves upwards.
- This behavior contrasts with ohmic conductors, which have a linear I-V relationship where resistance remains constant.
Explanation
Why this works
This answer effectively demonstrates an understanding of the non-ohmic behavior of filament lamps compared to ohmic conductors, testing the student's grasp of I-V characteristics and the underlying physics principles.
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