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Question
What happens during regulation action of a Zener diode?
- The current in and voltage across the Zenor remains fixed.
- The current through the series Resistance (Rs) changes.
- The Zener resistance is constant.
- The resistance offered by the Zener changes.
Options
a and b
b and d
b and c
c and d
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Solution
b and d
Explanation:
Symbolically zener diode represents this: In the forward bias, the zener diode acts as an ordinary diode. It can be used as a voltage regulator.
Zener diode as a voltage regulator
A zener diode when reverse biases offer constant voltage drop across terminals as the unregulated voltage is applied across the circuit to regulate. Then during the regulation action of a Zener diode, the current through the series of resistance Rs changes and resistance offered by the Zener changes. The current through the Zener changes but the voltage across the Zener remains constant.
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