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A student investigates how the resistance of a light dependent resistor (LDR) changes with light intensity - OCR Gateway - GCSE Physics - Question 10 - 2020 - Paper 1
Question 10
A student investigates how the resistance of a light dependent resistor (LDR) changes with light intensity. A Resistance 0 Light intensity B
Worked Solution & Example Answer:A student investigates how the resistance of a light dependent resistor (LDR) changes with light intensity - OCR Gateway - GCSE Physics - Question 10 - 2020 - Paper 1
Step 1
A
Answer
The graph should depict an inverse relationship between the resistance of a light dependent resistor (LDR) and light intensity. As light intensity increases, the resistance of the LDR decreases. Therefore, the graph should slope downward from left to right, starting high on the resistance axis when light intensity is low, and approaching zero resistance as light intensity increases.
Step 2
B
Answer
A suitable answer could state that as the light intensity is increased, the resistance decreases, which means that the LDR effectively becomes a better conductor, allowing more current to flow through it with increasing light. This demonstrates the properties of an LDR and its application in circuits reliant on light levels.