The Zener Diode: Practice Problems
Students complete 10 practice problems. These deal with the determination of series current, zener current, and load current, and if the zener diode is operating in the breakdown region.
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In a Zener diode voltage regulator circuit,the source series resistance Rs 20 ohm .Zener voltage Vz=18 volt.and lode resistance Rl=200 ohm.If source voltage Vs can vary from 20 volt to 30 volt ,find the maximum and minimum current in the diode?

From the question;
•Vrs=20V18V=2V, Irs=2÷20=0.1A, Irl=18÷200=0.09A, then Iz=0.10.09=0.01A,
•Vrs=30V18V, Irs=12÷20=0.6A, Irl=18÷200=0.09A, then Iz=0.60.09=0.51A,
Therefore the minimum current is 0.01A or 10mA and the maximum current is 0.51A or 510mA
Posted by Salaudeen Ilyas on 12/15/2015 1:36:29 AM Votes 0.00 Thumps Up Thumps Down
A 12 V zener has a positive temperature coefficient of How much will the
zener voltage change when the junction temperature decreases 50 degrees Celsius?
Determine beta Dc and IE for a transistor where IB =40 AM and IC =3.65 mA
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