Question

Explain how a zener diode can be used as voltage
stabilizer providing constant voltage from a
source whose vettage may vary appreciably​

Answer 1

When the reverse bias voltage on a normal crystal diode is increased, a point known as Knee point is reached at a voltage known as breakdown voltage, when the reverse current increases sharply to a high value. This breakdown voltage is also known as Zener Voltage and the sharp increase in current is known as Zener current.