JEE Main · 2022 · 26 Jul 2022 · Shift 1 · Semiconductors

In the circuit shown below, maximum zener diode current will be ______ mA

Answer: 9

Solution

The maximum zener current occurs at maximum input voltage (120 V).

Current through the series resistor:

I = \frac{V _{in} - V _{Z}}{R _{s}} = \frac{120 - 60}{4000} = \frac{60}{4000} = 0.015 A = 15 m A

Load current:

I_{L} = \frac{V _{Z}}{R _{L}} = \frac{60}{10000} = 0.006 A = 6 m A

Zener current (by Kirchhoff's current law):

I_{Z} = I - I_{L} = 15 - 6 = 9 mA

JEE Main · 2022 · 26 Jul 2022 · Shift 1 · Integer answer