A Zener diode is normally operated
- A. in forward bias as a rectifier
- B. in reverse bias at its breakdown voltage, as a voltage regulator
- C. with no bias at all
- D. only at very high frequency
Explanation
Beyond the breakdown voltage a Zener conducts heavily while the voltage across it stays almost constant, which makes it a simple and effective voltage reference. Unlike an ordinary diode this breakdown is non destructive provided a series resistor limits the current. In forward bias it behaves like any other silicon diode.