# maximum load current in zener diode

Discussion in 'Homework Help' started by Hafiz Rafeeq, Sep 7, 2015.

1. ### Hafiz Rafeeq Thread Starter New Member

Sep 7, 2015
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in the circuit shown, find maximum load current

2. ### bwilliams60 Active Member

Nov 18, 2012
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If this is homework, it should go under the homework tab. Have you made any attempt at doing this yourself? Perhaps some background would help.

3. ### ericgibbs AAC Fanatic!

Jan 29, 2010
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hi Hafiz,

You have shown a supply voltage of only 3.2 Volts, is this correct.?
E

4. ### Alec_t AAC Fanatic!

Sep 17, 2013
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What are the component values?

5. ### PeterCoxSmith Member

Feb 23, 2015
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in the circuit given the current is constant (3.2/(R1+RV1)) (until the battery runs down) and the zener diode will never turn on

Roderick Young likes this.
6. ### Hafiz Rafeeq Thread Starter New Member

Sep 7, 2015
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sorry the qstn was wrong...

Feb 23, 2015
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24V/RV1

8. ### Hafiz Rafeeq Thread Starter New Member

Sep 7, 2015
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but i am looking for a specific numeric answer

9. ### crutschow Expert

Mar 14, 2008
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You've been given enough information to calculate that.

10. ### Hafiz Rafeeq Thread Starter New Member

Sep 7, 2015
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t
the people who gave me the question at least think so..

11. ### #12 Expert

Nov 30, 2010
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I'm going to Tennessee. I don't know how far it is but I will be traveling at 65 miles per hour. How long will I have to drive at that speed. I want a specific numeric answer.

absf likes this.
12. ### ian field AAC Fanatic!

Oct 27, 2012
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What was the number they came up with on The Hitch Hikers Guide to the Galaxy?

#12 likes this.

Nov 30, 2010
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Forty-two.

14. ### Alec_t AAC Fanatic!

Sep 17, 2013
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42. (Sorry, I forgot we're not allowed to give answers to Homework questions ).

Edit: Pipped at the post by #12!

15. ### PeterCoxSmith Member

Feb 23, 2015
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then start putting in some numbers. You know you want 10mA through the zener so set the value of R1 with RV1 open circuit. Change value of RV1 and see how R1 must change to keep 10ma in the zener plus the current in RV1. Try a whole series of values for RV1, plot some graphs. Use Excel.

16. ### DerStrom8 Well-Known Member

Feb 20, 2011
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This forum is not here to do your homework for you. That's your job.

17. ### WBahn Moderator

Mar 31, 2012
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MOD NOTE: Moved from General Electronics Chat to Homework Help.

Apr 5, 2008
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19. ### WBahn Moderator

Mar 31, 2012
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It depends on what specifications you make regarding the design.

First, are you sure that the power rating on the zener is 600 W and not 600 mW?

A common design approach for a circuit like this (at least in an academic setting) is to design the circuit so that the zener is operating at it's maximum current allowable when the load is at one of its extreme limits. What would that mean for this circuit?

20. ### bwilliams60 Active Member

Nov 18, 2012
851
136
I could have swore someone already said that.