From the circuit shown below, the maximum and minimum value of zener diode current are :
6mA,5mA
14mA,5mA
9mA,1mA
3mA,2mA
A
9mA,1mA
B
6mA,5mA
C
14mA,5mA
D
3mA,2mA
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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 50V will be across 5KΩ resistance.
Thus, minimum voltage across 5KΩ resistance is 80V−50V=30V
Current through 5KΩ resistance is I1(say)
I1=305000=6mA
Also, maximum voltage across 5KΩ resistance is 120V−50V=70V
Current through 5KΩ resistance is I′1...(say)
I′1=705000=14mA
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