Question

What happens during regulation action of a Zener diode?

1. The current in and voltage across the Zenor remains fixed.
2. The current through the series Resistance (R_s) changes.
3. The Zener resistance is constant.
4. The resistance offered by the Zener changes.

विकल्प

• a and b

• b and d

• b and c

• c and d

Answer 1

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 R_s changes and resistance offered by the Zener changes. The current through the Zener changes but the voltage across the Zener remains constant.