Exam-style question
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What effect does an LDR have on the output voltage of a potential divider in low light conditions?.
- A.Increases the output voltage
- B.Decreases the output voltage
- C.Has no effect on the output voltage
- D.Makes the output voltage zero
Model answer
What a good answer should say
- Decreases the output voltage
Explanation
Why this works
In low light conditions, the resistance of the LDR increases, which reduces the current through the potential divider. This leads to a decrease in the output voltage across the LDR.
Common mistake
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