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2 (a) Figure 4 shows the results from an experiment where the potential difference (voltage) across a filament lamp was varied - Edexcel - GCSE Physics - Question 3 - 2021 - Paper 1
Question 3
2 (a) Figure 4 shows the results from an experiment where the potential difference (voltage) across a filament lamp was varied. The current and voltage were measure... show full transcript
Worked Solution & Example Answer:2 (a) Figure 4 shows the results from an experiment where the potential difference (voltage) across a filament lamp was varied - Edexcel - GCSE Physics - Question 3 - 2021 - Paper 1
Step 1
Describe the relationship between the current and the voltage as shown in the graph in Figure 4.
Answer
The graph indicates a positive relationship between current and voltage. As the voltage increases, the current also increases, suggesting that the filament lamp operates under conditions where it follows Ohm's Law initially.
Specifically, this means that the filament lamp exhibits an increasing current with increasing voltage, indicating that it may resist as the temperature rises during operation. The curve becomes less steep beyond a certain voltage (point Q), showing that the increase in current begins to taper off, indicating the filament is approaching its limits of conductivity.