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The Zener Diode: Practice Problems

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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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Posted by souvik on 3/2/2015 5:43:11 AM Votes 0.00 Thumps Up Thumps Down

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?

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  • 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

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    Posted by Salaudeen Ilyas on 12/15/2015 1:36:29 AM Votes 0.00 Thumps Up Thumps Down
Posted by Farooq Ali Meo on 4/9/2016 12:26:52 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?

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Posted by Khalil Bugti on 12/22/2016 10:02:50 AM Votes 0.00 Thumps Up Thumps Down

Determine beta Dc and IE for a transistor where IB =40 AM and IC =3.65 mA

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