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Question

# From the circuit shown below, the maximum and minimum value of zener diode current are :6 mA, 5 mA14 mA, 5 mA9 mA, 1 mA3 mA, 2 mA

A
9 mA, 1 mA
B
6 mA, 5 mA
C
14 mA, 5 mA
D
3 mA, 2 mA
Solution
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#### The Zener diode acts as the voltage regulator in the circuit and the voltage supply is variable hence, excess of voltage over 50 V will be across 5KΩ resistance.Thus, minimum voltage across 5KΩ resistance is 80 V−50 V=30 V Current through 5KΩ resistance is I1(say)I1=305000=6 mAAlso, maximum voltage across 5KΩ resistance is 120 V−50 V=70 V Current through 5KΩ resistance is I′1...(say)I′1=705000=14 mA

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