Which graph shows the relationship between temperature and resistance for a NTC thermistor?
A
B
C
D - OCR Gateway - GCSE Physics - Question 4 - 2022 - Paper 1
Question 4
Which graph shows the relationship between temperature and resistance for a NTC thermistor?
A
B
C
D
Worked Solution & Example Answer:Which graph shows the relationship between temperature and resistance for a NTC thermistor?
A
B
C
D - OCR Gateway - GCSE Physics - Question 4 - 2022 - Paper 1
Step 1
Identify the relationship for NTC thermistors
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Answer
NTC (Negative Temperature Coefficient) thermistors exhibit a decrease in resistance as the temperature increases. This means that at higher temperatures, the thermistor conducts electricity better, leading to lower resistance.
Step 2
Examine the provided graphs
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Answer
When reviewing the graphs:
Graph A shows resistance increasing with temperature, which is not characteristic of an NTC thermistor.
Graph B also shows an increasing trend, indicating that resistance rises with temperature, which is incorrect.
Graph C illustrates resistance decreasing as temperature rises, aligning with the behavior of a NTC thermistor.
Graph D displays a decreasing resistance initially but suggests a plateau or increase at higher temperatures, which does not reflect typical NTC behavior.
Step 3
Choose the correct graph
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Answer
Given the analysis above, the correct graph that represents the relationship between temperature and resistance for a NTC thermistor is Graph C.
