Electronic Devices and Circuits - Engineering

Q1:

The 6 V zener diode shown in figure has zero zener resistance and a knee current of 5 mA. The minimum value of R, so that the voltage across it does not fall below 6 V is

A 1.2 kΩ

B 80 Ω

C 50 W

D 0

ANS:B - 80 Ω

Source current, Is = (10-6)/50 = 80 mA.

Knee current = 5 mA.
So, load current = 80 - 5 = 75 mA.

Hence, the minimum load resistance = 6/75 = 80Ω