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=20V-18V=2V, Irs=2÷20=0.1A, Irl=18÷200=0.09A, then Iz=0.1-0.09=0.01A,
•Vrs=30V-18V, Irs=12÷20=0.6A, Irl=18÷200=0.09A, then Iz=0.6-0.09=0.51A,
Therefore the minimum current is 0.01A or 10mA and the maximum current is 0.51A or 510mA