Electronic parallel voltage sources exercises?


by Femme_physics
Tags: electronic, exercises, parallel, sources, voltage
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#1
Jul7-11, 01:51 AM
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I'm trying to google for some but results often lead me to forum questions, theory articles, etc. Basically I'm looking for circuits questions with parallel voltage sources answers, where I am supposed to do the work to find out the solution for the current.
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Jul7-11, 04:00 AM
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Hi Fp!

I'll give you a problem (found on PF).




given this circuit find the current on R1,R2 and R3.


Can you solve it?
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#3
Jul7-11, 04:08 AM
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And here's a second one.
Perhaps you can start a separate thread for this problem?


For the circuit shown below, determine the voltage for each of the
resistors and label the values on the diagram.
Attached Thumbnails
kirchhoffproblem.jpg  

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Jul7-11, 05:44 AM
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Electronic parallel voltage sources exercises?


Thanks, ILS! I'll take a crack at it soon ^^
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Jul8-11, 12:32 AM
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Attached Thumbnails
kirchhoffproblem2text.png   kirchhoffproblem2pic.png  
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Jul9-11, 01:02 AM
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Quote Quote by I like Serena View Post


Also too easy I think I'll skip it. I'm really looking for one with parallel voltage sources. I've been googling but it's hard to find an exercise with answers. Do you happen to remember or have another one I can work on?
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#7
Jul9-11, 01:13 AM
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Too easy eh? I guess I have not been anticipating your phenomenal progress!

Ok.
How about this one?

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Jul9-11, 01:21 AM
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Eep.





Yikes.



Looks intimidating.




*touches her lucky item to imbue self with ILS-like powers*

I'll give it a shot!
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#9
Jul9-11, 01:59 AM
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Once the item has inspired you enough to finish the problem, I have another one here.
I hope it's not too easy!

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#10
Jul9-11, 02:24 AM
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Uh, where are the voltage sources?
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#11
Jul9-11, 02:28 AM
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Quote Quote by Femme_physics View Post
Uh, where are the voltage sources?
Who needs voltage sources, when you can get current sources?
Or are you certain you won't get those?

It seemed smart to me, to not only practice exactly the same problem over and over, but to vary it a bit and make sure you're not thrown off by some detail that should not matter.
The method is exactly the same....
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Jul9-11, 02:31 AM
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Yes, but I don't know where are they located! Shouldn't you tell me at least where are they located if not their value?
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#13
Jul9-11, 02:38 AM
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There are no voltage sources.
Instead there are current sources that are similar.

An (ideal) voltage source provides a constant voltage.
An (ideal) current source provides a constant current (the voltage drop is zero).
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#14
Jul9-11, 03:12 AM
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Oh, well we haven't studied about that, I'm pretty sure it's not gonna be on the test! Should I really be trying to solve that?
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#15
Jul9-11, 03:24 AM
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Well, yeah!

To get a perfect score, you need to be able to play with the material.
It does not suffice that you have drilled one specific exercise over and over.
You need to have the confidence that whatever they throw at you, you simply know it won't matter, because you know your stuff, and are not thrown off by surprises!

That is, unless you're content with doing just well enough to pass the test.
(But then you'll have these guys looming over you that you don't dare contradict, because you're not sure whether you know better. )

(And if you don't do these exercises, you'll not be spending time with me! Sniff! )
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Jul9-11, 11:00 AM
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Quote Quote by Femme_physics View Post
Yes, but I don't know where are they located! Shouldn't you tell me at least where are they located if not their value?
You can transform voltage and current sources interchangeably with resistors.

If you want a big list of circuits problems I would get the Schaum's outline of Electric Circuits btw.
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#17
Jul10-11, 08:03 AM
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Quote Quote by I like Serena View Post
There are no voltage sources.
Instead there are current sources that are similar.

An (ideal) voltage source provides a constant voltage.
An (ideal) current source provides a constant current (the voltage drop is zero).

Well, what's the physical difference between a current source and a voltage source? Voltage source is plus and minus. A place with lower amount electrons connected to a place with greater amount of electrons....Is a current source the same?
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#18
Jul10-11, 08:14 AM
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Quote Quote by Femme_physics View Post
Well, what's the physical difference between a current source and a voltage source? Voltage source is plus and minus. A place with lower amount electrons connected to a place with greater amount of electrons....Is a current source the same?
Uh yes, in the sense that you mention it is the same.
The physical difference is that a voltage source has a fixed voltage difference and a variable current, depending on the circuit.
Whereas a current source generates a fixed current and a variable voltage difference, depending on the circuit.

(Btw, I have to retract my statement that the voltage drop across a current source is zero. It isn't.)


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