Exam-style question
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What is a key characteristic of a filament lamp's I-V graph?.
- A.It is a straight line through the origin.
- B.It shows a linear increase in current with potential difference.
- C.It curves upwards, indicating increasing resistance.
- D.It remains constant regardless of potential difference.
Model answer
What a good answer should say
- It curves upwards, indicating increasing resistance.
Explanation
Why this works
The I-V graph of a filament lamp is defined by its upward curve, indicating that resistance increases as the temperature rises with increasing current. The key difference from ohmic conductors is that the relationship is non-linear, demonstrating that the filament lamp does not follow Ohm's law.
This applies in practical applications where lamps are used, concluding that understanding this behavior is crucial for designing lighting circuits.
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