Q. In a zener diode, the current is controlled by

A
potential barrier
B
Reverse bias voltage
C
External circuits
D
Zener diode resistance
Solution:

In power supplies and many other circuits, Zener diode finds its application as a constant voltage provider or a voltage reference. The only conditions are that the input voltage should be greater than zener voltage and the series resistor should have a minimum value such that the maximum current flows through the device. so voltage given by an external circuit

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