In reverse breakdown, what is the characteristic function of a Zener diode?

Get ready for the EVT F4 Electrical Systems and Components Test. Utilize our quizzes with flashcards and multiple choice questions, each paired with hints and explanations to boost your confidence and knowledge.

Multiple Choice

In reverse breakdown, what is the characteristic function of a Zener diode?

In reverse breakdown, a Zener diode is used to hold the voltage across it at a nearly fixed value. When reverse voltage reaches the Zener voltage, the diode conducts and the voltage across it stays almost constant even as the current changes. This makes it ideal as a voltage regulator or reference, because it clamps the voltage to a specific level despite supply or load variations. The other statements don’t fit this behavior: in forward bias it would drop about 0.7 volts like a normal diode, it does have a defined breakdown voltage, and rectifying AC isn’t its primary role in this context.

In reverse breakdown, a Zener diode is used to hold the voltage across it at a nearly fixed value. When reverse voltage reaches the Zener voltage, the diode conducts and the voltage across it stays almost constant even as the current changes. This makes it ideal as a voltage regulator or reference, because it clamps the voltage to a specific level despite supply or load variations. The other statements don’t fit this behavior: in forward bias it would drop about 0.7 volts like a normal diode, it does have a defined breakdown voltage, and rectifying AC isn’t its primary role in this context.

More practice questions