Figure 12 shows a graph of current against potential difference for an electrical component - Edexcel - GCSE Physics - Question 6 - 2018 - Paper 1
Question 6
Figure 12 shows a graph of current against potential difference for an electrical component.
Which electrical component will show this variation of current with pote... show full transcript
Worked Solution & Example Answer:Figure 12 shows a graph of current against potential difference for an electrical component - Edexcel - GCSE Physics - Question 6 - 2018 - Paper 1
Step 1
Which electrical component will show this variation of current with potential difference?
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Answer
The correct answer is D, a diode. A diode allows current to flow in one direction only and will exhibit a nonlinear relationship between current and potential difference, as shown in the graph.
Step 2
Calculate the power of the lamp.
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Answer
To calculate the power of the lamp, we use the formula: P=IimesV
Substituting the values gives us: P=0.12Aimes0.24V=0.0288W
Rounded to three significant figures, the power is approximately 0.029 W.
