Exam-style question
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LDR doorway sensor ? identify why a darker room changes the output state. Use this to support: Describe the purpose of modulation.
- A.LDR doorway sensor: reduced light changes LDR resistance and shifts the divider output for Amplitude and frequency modulation.
- B.LDR doorway sensor: uses magnetic flux instead of light intensity.
- C.LDR doorway sensor: treats the LDR as a fixed resistor.
- D.LDR doorway sensor: omits the output switching condition.
Model answer
What a good answer should say
- The correct option is LDR doorway sensor: reduced light changes LDR resistance and shifts the divider output for Amplitude and frequency modulation.
Explanation
Why this works
This is the best answer because the LDR doorway sensor context requires that exact electronics relationship. The other options are incorrect because they use a different component, reverse the circuit behaviour, or omit the output interpretation required for Amplitude and frequency modulation.
Common mistake
No common mistake is linked to this question yet.