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Figure 17 shows two different types of the same circuit component - Edexcel - GCSE Physics - Question 8 - 2021 - Paper 1
Question 8
Figure 17 shows two different types of the same circuit component. What is the name of this circuit component? A diode B light dependent resistor C thermistor D va... show full transcript
Worked Solution & Example Answer:Figure 17 shows two different types of the same circuit component - Edexcel - GCSE Physics - Question 8 - 2021 - Paper 1
Step 1
Step 2
Which row in the table describes the way that ammeters and voltmeters should be connected to a component in a circuit?
Answer
The correct configuration is: C - ammeter in series with the component, voltmeter in parallel. This setup ensures accurate readings of current and potential difference respectively.
Step 3
Describe the relationship between the current and the voltage as shown in the graph in Figure 18.
Answer
The graph in Figure 18 shows a positive correlation between current and voltage. As the potential difference (voltage) increases, the current also increases. However, this relationship is not linear, as indicated by the curve of the graph, which suggests that the resistance of the filament lamp is changing as the voltage increases.
Step 4
Use the values of the voltage and current at point P and at point Q on the graph in Figure 18 to complete the table in Figure 19.
Answer
At point P, the voltage is approximately 1.5 V and the current is about 10 mA. At point Q, the voltage is approximately 4.5 V and the current is about 51 mA.
Step 5
Step 6
Explain why the resistance of the filament lamp changes as the voltage across it increases.
Answer
As the voltage increases, the temperature of the filament lamp rises due to increased current flow. This increase in temperature causes the resistance of the filament to increase. This phenomenon occurs because the atoms in the filament vibrate more at higher temperatures, which impedes the flow of electrons, leading to a higher resistance.