Exam-style question
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How does the slope of the IV graph of an ohmic conductor change as temperature increases?.
- A.Slope decreases
- B.Slope increases
- C.Graph becomes curved
- D.Graph remains unchanged
Model answer
What a good answer should say
- Slope decreases
Explanation
Why this works
Evidence: The slope of the IV graph decreases as temperature increases. Interpretation: The resistance of the conductor increases with temperature.
Implication: The current for a given voltage decreases. Conclusion: The IV graph of an ohmic conductor will have a lower slope at higher temperatures.
Common mistake
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