Exam-style question
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Explain how a photodiode operates when exposed to light.
Model answer
What a good answer should say
- A photodiode generates a photocurrent when light falls on it, due to the creation of electron-hole pairs in the semiconductor material.
- The intensity of the light affects the number of charge carriers generated, thus influencing the magnitude of the photocurrent.
Explanation
Why this works
This answer demonstrates understanding of the photodiode's function and the relationship between light intensity and photocurrent. It tests the student's ability to explain the operational principles of a photodiode, which is crucial for applying this knowledge in practical circuits.
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