# Need help on few calculation questions

Discussion in 'Homework Help' started by jx123, Oct 27, 2010.

1. ### jx123 Thread Starter New Member

Oct 16, 2010
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0
Hi there ,

Thanks for the help.

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Oct 16, 2010
8
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Hi all ,

Thanks.

3. ### beenthere Retired Moderator

Apr 20, 2004
15,815
282
The section is Homework Help, not solutions. Those problems are not overly challenging - have you made any attempts? Here is some material out of our Ebook that will let you answer at least one question - http://www.allaboutcircuits.com/vol_3/chpt_8/5.html

4. ### jx123 Thread Starter New Member

Oct 16, 2010
8
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Hi ,

Any solution ?

5. ### thatoneguy AAC Fanatic!

Feb 19, 2009
6,357
718
Do you have ANY of the questions answered?

Is there a particular one you are having problems understanding?

It is multiple choice, and about half the answers are blatantly wrong, leaving you with a 50/50 shot at it, unless you can't figure out which ones are obviously wrong.

We are here to help you learn, not simply give answers. No abilities are acquired by knowing the answer to a particular question, without knowing why it is the answer.

6. ### jx123 Thread Starter New Member

Oct 16, 2010
8
0
Thatoneguy and others ,

I really do not know the answer of these multiple choices , and I like to learn and try to figure out by searching books and internet but still helpless .

So, I have to seek for help in this forum . If you have answers , please tell me . And if possible just drop some words to explain it .

If you think that the question and multiple choice itself are not correct , please point out which question has problem.

I really need the guide .

Thanks.

7. ### thatoneguy AAC Fanatic!

Feb 19, 2009
6,357
718
In question 1,

Is the source AC or DC?

If AC, what is the impedance of the load (the 3 capacitors)?

If DC, what will happen?

Does current flow through the load?

8. ### jx123 Thread Starter New Member

Oct 16, 2010
8
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Thatoneguy ,

It is AC Source .
The impendance for these 3 capacitors are not given (unknown)
The current flow through all 3 loads

Which choice do you think could be the best answer, of course , please drop some explanation by your choice.

9. ### thatoneguy AAC Fanatic!

Feb 19, 2009
6,357
718
The symbol for the source is a battery. It has no frequency listed to be an AC source, which is needed to calculate impedance to solve the problem.

I think they are looking for what happens at the moment the battery is connected with all of the capacitors discharged.

10. ### jx123 Thread Starter New Member

Oct 16, 2010
8
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Hello ,

If the first question is confused , how about other question ?

Need help ...

11. ### beenthere Retired Moderator

Apr 20, 2004
15,815
282
The link I gave you to our Ebook completely explains the answer to question #2. Sometimes you have to read and learn.

12. ### jx123 Thread Starter New Member

Oct 16, 2010
8
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Thanks .

Understand your objectives want me to read and solve the problem by myself . Since I get stuck , so , I ask .

How about Q#3 to Q#7 ??

As I mentioned , I try but I fail , so, I ask the experts here .

If I can answer by reading it , then I won't post the questions for help .

If the experts have answers , why don't just direct point out and educate me instead of asking me to read and solve by myself .

13. ### beenthere Retired Moderator

Apr 20, 2004
15,815
282
If we simply do that, what have you learned? What will you do then next time a similar question comes up?

The function of education is to provide you with enough general knowledge that you can apply it to specific questions/problems and arrive at a correct answer.

14. ### JoeJester AAC Fanatic!

Apr 26, 2005
3,373
1,157
Where did you get these test questions?

Beenthere pointed you to a set of books to assist you in educating yourself. You can ask specific questions, but, you must provide your own attempts at answering them.

Demanding answers won't get you a response.

15. ### jx123 Thread Starter New Member

Oct 16, 2010
8
0
Beenthere,

The Q2 is positive feedback . Positive feedback creates a condition of hysteresis .
So, the resistors in this circuit should "provide hysteresis" .
Am I right ?

For Q6 , any suggested link ?

Thanks