# Help with a circuit question

Discussion in 'Electronics Homework Help' started by MrMoose, Jul 22, 2013.

1. ### MrMoose

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0
Jul 22, 2013
Can someone answer this question for me?

In the circuit shown, the emitter voltage is zero. What is the problem?

1. R1 is open.
2. R2 is open.
3. Capacitor C is shorted.
4. R4 is open.

Thanks for any help....studying this stuff has me to the point I am arguing with myself over the answers.

Dave

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2. ### (*steve*)¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥdModerator

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Jan 21, 2010
OK, consider:

1) 0V with respect to what?

2) What components are directly between the emitter and a source of that potential?

126
38
Apr 21, 2011
Since this is your homework, I think you should tell us what you think will happen in each case 1, 2, 3, 4.

Then we can discuss any flaws in your arguments...

Simply "answering the question" for you is not what homework help is about.

Do we assume that nothing is connected to input and output?

Last edited: Jul 22, 2013
4. ### Y2KEDDIE

259
15
Sep 23, 2012
Cicuit Diagram

I'm curious; what does the inverted triangles represent? Is that your symbol for ground/common? Also is Vee positive or negative?

I would make certain assumptions considering it's a PNP transistor.

5. ### davennModerator

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Sep 5, 2009
that's a pretty common symbol for GND

Dave

6. ### GENESIS_42

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0
Jul 23, 2013
You didn't mentioned the value of the resistors & the capacitor,and what kind of mesurement did you used?How can we know that those components are shorted or open?

7. ### (*steve*)¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥdModerator

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Jan 21, 2010
It's homework. It will essentially work for any positive, finite value.

8. ### alfa88

344
5
Dec 1, 2010
Why not lay it out on a protoboard and end the argument with yourself?

9. ### (*steve*)¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥdModerator

25,496
2,837
Jan 21, 2010
MrMoose has probably already found someone willing to give him the answer already, but in case he hasn't, let's not do his homework for him eh?

Perhaps (and this is a gentle hint) we can stop posting now unless he returns.