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The 6V Zener diode shown has zener resistance and a knee current of 5mA. The minimum value of R so that the voltage does not drop below 6V is?(a) 1.2Ω(b) 80 Ω(c) 50 Ω(d) 70 ΩThe question was posed to me by my school principal while I was bunking the class.My question is from Breakdown Diodes in chapter Semiconductor-Diode Characteristics of Electronic Devices & Circuits

Answer»

The correct CHOICE is (B) 80 Ω

Explanation: Here, VZ =6V, IZMIN=5mA.IS=IZMIN+ILMAX.

80=5+ILMAX . ILMAX=75Ma.RLMIN=VI/ILMAX=6/75mA

=80 Ω.



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