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A student investigates how current and potential difference vary in different components - OCR Gateway - GCSE Physics - Question 4 - 2019 - Paper 1
Question 4
A student investigates how current and potential difference vary in different components. Look at the graphs of her results. A Current Potential difference B C... show full transcript
Worked Solution & Example Answer:A student investigates how current and potential difference vary in different components - OCR Gateway - GCSE Physics - Question 4 - 2019 - Paper 1
Step 1
Which graph shows a filament lamp?
Answer
The correct graph that shows a filament lamp is graph B.
Explanation
A filament lamp exhibits a non-linear relationship between current and potential difference. This is characterized by an initial increase in current with potential difference, followed by a gradual increase in resistance as the filament heats up, leading to a curved graph.
In graph B, the increase in current is gradual but does not show a straight line, indicating that the filament is heating up and the resistance is changing, thus confirming it represents a filament lamp.