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The diagram shows a light dependent resistor (LDR) and a graph of the resistance of the LDR against the brightness of light falling on it - Junior Cycle Science - Question b - 2009
Question b
The diagram shows a light dependent resistor (LDR) and a graph of the resistance of the LDR against the brightness of light falling on it. (i) Give an everyday use ... show full transcript
Worked Solution & Example Answer:The diagram shows a light dependent resistor (LDR) and a graph of the resistance of the LDR against the brightness of light falling on it - Junior Cycle Science - Question b - 2009
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Describe an experiment to measure the resistance of an LDR under varying degrees of brightness of light.
Answer
To measure the resistance of an LDR, you can set up a simple circuit.
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Connect the LDR to an Ohmmeter: Connect one terminal of the LDR to one terminal of an ohmmeter and the other terminal of the LDR to the other terminal of the ohmmeter. Ensure the connections are secure and correct.
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Draw the Circuit Diagram: The circuit diagram should display the LDR symbol connected to the ohmmeter, which is depicted by a circle with the letter 'Ω' inside it.
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Vary the Brightness of Light: To vary the brightness, you can move a light source closer to or further away from the LDR. Alternatively, you can shade the LDR with your hand to block light or use a dimmer light source.