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Define Zener diode behaviour and ordinary diode behaviour. What is the key difference between them?.
Model answer
What a good answer should say
- Zener diodes allow current to flow in the reverse direction when the reverse voltage exceeds a certain value, known as the Zener breakdown voltage.
- Ordinary diodes, on the other hand, only allow current to flow in one direction and block reverse current until a much higher reverse voltage causes breakdown.
- The key difference is that Zener diodes are designed to operate in reverse breakdown, while ordinary diodes are not.
- Zener diodes are used in voltage regulation applications, whereas ordinary diodes are used for rectification.
Explanation
Why this works
This answer effectively defines both types of diodes and highlights their key difference in behaviour under reverse voltage. It explains the applications of each type, demonstrating a clear understanding of their distinct functions.
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