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A group of students investigate the resistance of an LDR - OCR Gateway - GCSE Physics - Question 19 - 2022 - Paper 1
Question 19
A group of students investigate the resistance of an LDR. The students change the distance between the LDR and the lamp and measure the resistance of the LDR. The ... show full transcript
Worked Solution & Example Answer:A group of students investigate the resistance of an LDR - OCR Gateway - GCSE Physics - Question 19 - 2022 - Paper 1
Step 1
Explain the relationship observed in Fig. 19.2
Answer
The graph indicates that as the distance between the LDR and the lamp increases, the resistance of the LDR also increases. This relationship is likely due to the decrease in light intensity received by the LDR as it moves further from the lamp, leading to higher resistance.
Step 2
Describe the factors that might affect the results of the experiment
Answer
Several factors can influence the results:
- Ambient Light: Other light sources in the environment may affect the readings by illuminating the LDR, which could lead to varying resistance values.
- Temperature: Variations in temperature can also affect the materials and result in changes in resistance.
- Positioning: The angle and exact positioning of the LDR relative to the lamp may alter the intensity of light falling on the LDR, affecting the measured resistance.
Step 3
Suggest improvements to the experiment
Answer
To improve the experiment, the following modifications could be made:
- Control Ambient Light: Conduct the experiment in a dark room to eliminate the influence of external light sources.
- Use a More Precise Measuring Device: Implement a more sensitive resistance meter for more accurate readings.
- Systematic Approach: Measure resistance at systematically spaced distances to acquire a more thorough dataset that reflects the relationship accurately.