Zener Diodes & Regulation — A/L Physics

How do I practise Zener Diodes & Regulation?

1 question with a worked solution

1. In a voltage regulator circuit, how must a Zener diode be connected relative to the unregulated DC input voltage, and in which operating region does it maintain a nearly constant terminal voltage?
   1. A) In forward bias in series with the load, operating in the forward conduction region
   2. B) In forward bias across the load, operating in the saturation region
   3. C) In reverse bias in series with the load, operating below the knee voltage
   4. D) In reverse bias across the load, operating in the reverse breakdown (Zener breakdown) region
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   Correct answer: D) In reverse bias across the load, operating in the reverse breakdown (Zener breakdown) region

   A Zener diode is designed to operate in reverse bias beyond its breakdown voltage (V_Z). In this reverse breakdown region, the diode current can vary widely while the voltage across its terminals remains virtually constant, providing excellent voltage stabilization across a parallel load.

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   Step 1: Zener regulators operate in reverse breakdown. Step 2: Connected in parallel (across) the load with a current-limiting series resistor. Answer: In reverse bias across the load, operating in the reverse breakdown (Zener breakdown) region.
   Modelled on: the A/L Physics examination pattern

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Where does Zener Diodes & Regulation fit in the syllabus?

Unit 9.3 · Year 2 · Term 2