Q. 145.0( 2 Votes )

What happens during regulation action of a Zener diode?
A. The current in and voltage across the Zenor remains fixed.

B. The current through the series Resistance (Rs) changes.

C. The Zener resistance is constant.

D. The resistance offered by the Zener changes.

Answer :


When a Zener diode is revers biased, it acts like a voltage regulator as in the breakdown region Zener diode has constant voltage for a large change in current. When an unregulated voltage is applied across the circuit shown, the Zener diode provides a constant voltage drop across it. During regulation, the current changes through the series resistance R that, leads to a change in the Zener diode resistance. This leads to a constant voltage output across its terminals and the voltage is regulated.

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