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Figure 10 shows two different types of the same circuit component - Edexcel - GCSE Physics Combined Science - Question 5 - 2021 - Paper 1
Question 5
Figure 10 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 10 shows two different types of the same circuit component - Edexcel - GCSE Physics Combined Science - Question 5 - 2021 - Paper 1
Step 1
Step 2
Step 3
Describe the relationship between the current and the voltage as shown in the graph in Figure 11.
Answer
The graph shows a nonlinear relationship between current and voltage. As the voltage increases, the current also increases, but the rate of increase differs throughout the range, indicating that the filament lamp's resistance is changing at different voltages.
Step 4
Use the values of the voltage and current at point P and at point Q on the graph in Figure 11 to complete the table in Figure 12.
Answer
From Figure 11, we can read the following values:
- At point P: Voltage = 1.5 V, Current = 20 mA
- At point Q: Voltage = 4.5 V, Current = 50 mA
Thus, the table in Figure 12 should be completed as follows:
| voltage in V | current in mA |
|---|---|
| 1.5 | 20 |
| 4.5 | 50 |
Step 5
Step 6
Explain why the resistance of the filament lamp changes as the voltage across it increases.
Answer
The resistance of the filament lamp changes with increasing voltage due to the increase in temperature of the filament. As the voltage increases, more current flows through the filament, causing it to heat up. The increase in temperature results in more vibrations of the metal lattice in the filament, leading to increased collisions between electrons and atoms, and thus a higher resistance at elevated temperatures. This is characteristic of non-ohmic conductors, such as filament lamps.