Electronic parallel voltage sources exercises?

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Discussion Overview

The discussion revolves around exercises related to electronic circuits, specifically focusing on parallel voltage sources and current sources. Participants seek problems to solve, share circuit diagrams, and discuss the differences between voltage and current sources, as well as the methods for analyzing circuits.

Discussion Character

  • Exploratory
  • Technical explanation
  • Homework-related
  • Debate/contested

Main Points Raised

  • One participant expresses difficulty finding exercises involving parallel voltage sources and requests specific circuit problems to solve.
  • Another participant shares circuit diagrams and encourages others to solve them, questioning the ease of the problems presented.
  • There is a discussion about the presence of current sources instead of voltage sources in some circuits, with participants debating the implications of this for problem-solving.
  • Participants discuss the physical differences between voltage sources and current sources, noting that voltage sources maintain a constant voltage while current sources maintain a constant current.
  • Some participants express uncertainty about solving problems involving current sources, indicating they have not studied them in class.
  • There are references to building equations using Kirchhoff's laws, with suggestions on how to approach circuits containing current sources.
  • One participant mentions a desire for more personalized greetings and interactions within the forum, indicating a social aspect to the discussion.

Areas of Agreement / Disagreement

Participants generally agree on the need for practice with various circuit problems, but there is disagreement regarding the relevance and familiarity of current sources in their studies. Some participants feel unprepared to tackle problems involving current sources, while others encourage exploration beyond their current curriculum.

Contextual Notes

Some participants express confusion about the symbols used for current sources and their implications in circuit analysis. There is also mention of a resource (Schaum's outline of Electric Circuits) for finding more circuit problems, indicating a limitation in the current discussion's scope.

  • #31
Femme_physics said:
Going back to this:

Io is in fact the current that flows in all across the last circuit I made, right?

Though I recognize it splits here


when it gets back to point a, does it kinda recombine and spits again? I'm not sure how to explain it...

Do you know what I mean?

When you merge the resistors, you can't "see" Io anymore.
You can calculate the voltage drop and the total current though.
Afterward you have to go back to the original circuit to find Io.
 
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  • #32
Forgot to answer
What's so confusing about it?
Or is it just that you didn't see it before?

Yes, it's because I've never seen it before.

I do know that mA means miliampere! I just wanted to know to which it belongs, and now you say it belongs to neither..

so those blue arrows are ANOTHER 3 unknowns?

http://img832.imageshack.us/img832/2659/bluecw.jpg

Uploaded with ImageShack.us
 
Last edited by a moderator:
  • #33
I like Serena said:
When you merge the resistors, you can't "see" Io anymore.
You can calculate the voltage drop and the total current though.
Afterward you have to go back to the original circuit to find Io.
I see, so after I find Itotal, I find V. And after I find V I just doV/R1 to find IoYes?
 
  • #34
Well, they are not all really "unknown" are they?
I think the leftmost one is 6 mA, don't you?
That doesn't sound "unknown" to me.
 
  • #35
Femme_physics said:
I see, so after I find Itotal, I find V. And after I find V I just do


V/R1 to find Io


Yes?

No, you will have to use KCL to find Io.
 
  • #36
I like Serena said:
Well, they are not all really "unknown" are they?
I think the leftmost one is 6 mA, don't you?
That doesn't sound "unknown" to me.

Oh, right *smacks forehead*


I like Serena said:
No, you will have to use KCL to find Io.


Alright, I see, give me a few moments to try and solve it...be right back with a scan
 
  • #37
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  • #38
I like Serena said:
Well, they are not all really "unknown" are they?
I think the leftmost one is 6 mA, don't you?
That doesn't sound "unknown" to me.

Good point! lol... that was kinda silly of me.

Okay then... should be easy ...hope I'm not oversimplifying it (which I tend to do)...

http://img714.imageshack.us/img714/6847/600il.jpg
 
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  • #39
Femme_physics said:
Well I'd hate to start solving this 5 eq 5 unknown thing, but this is it right? I mean, this is what it boils down to?

PS Maybe a mod can move this topic to the homework section?

You can do it this way, but I think you would prefer the "smooth ride".

After calculating I_total, don't go back right away to your original circuit, but take the top diagram you drew in your scan, where you have 2 merged resistors.

There you can determine the voltage drop to the middle.

Only then, go back to the original circuit and calculate all the currents with Ohm's law.

Then, finally apply KCL to find Io.
 
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  • #40
I like Serena said:
You can do it this way, but I think you would prefer the "smooth ride".

After calculating I_total, don't go back right away to your original circuit, but take the top diagram you drew in your scan, where you have 2 merged resistors.

There you can determine the voltage drop to the middle.

Only then, go back to the original circuit and calculate all the currents with Ohm's law.

Much easier indeed! Well, I doubt we'd have somethign that difficult on the test thankfuly, and speak of the devil... I'm off to college in a jiffy :smile: wish me luck

XoX

Edit: Actually I don't want too early, I'll try and solve it
 
  • #41
Femme_physics said:
Good point! lol... that was kinda silly of me.

Okay then... should be easy ...hope I'm not oversimplifying it (which I tend to do)...

No, that won't work.

In your loop (a) you treat the current source of 3 mA as a voltage source of 3 V.
But that is not right.
The corresponding voltage drop is unknown.
 
  • #42
I like Serena said:
You can do it this way, but I think you would prefer the "smooth ride".

After calculating I_total, don't go back right away to your original circuit, but take the top diagram you drew in your scan, where you have 2 merged resistors.

There you can determine the voltage drop to the middle.

Only then, go back to the original circuit and calculate all the currents with Ohm's law.

Then, finally apply KCL to find Io.


http://img834.imageshack.us/img834/9089/wttt.jpg


Uhh...okay what am I doing wrong? O_o

btw got less than 30 minutes:rolleyes:
 
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  • #43
I wish you luck! :smile:
 
  • #44
Femme_physics said:
Uhh...okay what am I doing wrong? O_o

btw got less than 30 minutes:rolleyes:

Go back to the original circuit.

Now you have the voltage drop between a and b, so you can calculate the currents through the left and right resistor.

Same for b and the bottom.
 
  • #46
Femme_physics said:
Well this is my last attempt due to time shortage but I don't see how I find Io in any of this:

Good!
Do the same between a and b to find I1 and I2.


Aftward apply KCL at point B to find Io.
 
  • #47
Last edited by a moderator:
  • #49
:smile:

It seems that thread didn't have such a smooth ride!
 

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