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Question

A Zener diode having break-down voltage 5.6V is connected in reverse bias with a battery of emf 10V and a resistance of 100Ω in series. The current flowing through the Zener is

A
88mA
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B
0.88mA
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C
4.4mA
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D
44mA
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Solution

The correct option is D 44mA
A Zener diode offers infinite resistance as long as the reverse voltage across it is less than the break-down value. As soon as the reverse bias voltage cross the break-down level, the residue voltage remains in the circuit with the diode offering zero resistance to it.
Hence here the voltage remaining across the Zener=10V5.6V=4.4V
Therefore the current in the circuit is 4.4V100Ω
=44mA

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