Exam-style question
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What is the key difference in the voltage-current characteristics of a Zener diode compared to an ordinary diode?.
- A.Zener diodes have a linear I-V characteristic.
- B.Zener diodes exhibit a sharp breakdown region in reverse bias.
- C.Ordinary diodes have a breakdown region in forward bias.
- D.Both diodes have identical I-V characteristics.
Model answer
What a good answer should say
- Zener diodes exhibit a sharp breakdown region in reverse bias.
Explanation
Why this works
The key difference lies in the I-V characteristics: Zener diodes show a distinct breakdown region when reverse-biased, allowing them to conduct and stabilize voltage. Ordinary diodes, however, do not have this feature and will block reverse current until breakdown occurs, which can lead to damage.
This characteristic is crucial for applications requiring stable voltage outputs.
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