Ncert Exercises & Solutions

What happens during the regulation action of a Zener diode?

a.	the current and voltage across the Zener remain fixed.
b.	the current through the series Resistance \((R_s)\) changes.
c.	the Zener resistance is constant.
d.	the resistance offered by the Zener changes.

Choose the correct option:

1.	(a, b)	2.	(b, d)
3.	(b, c)	4.	(c, d)

Hint: The resistance of the Zener diode varies with changes in the current flowing through it.

Explanation: The resistance of the Zener diode varies with the change in current. During voltage regulation, the current flowing through the series resistor \((R_s)\) changes, causing the Zener diode's current and resistance to vary. However, the voltage across the Zener diode remains constant throughout the process. Therefore, the current through the series Resistance \((R_s)\) changes and the resistance offered by the Zener also changes.
Hence, option (2) is the correct answer.

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