# [Urgent] Homework help (DC Circuits)

Discussion in 'Homework Help' started by pmendz2010, Mar 24, 2011.

1. ### pmendz2010 Thread Starter New Member

Mar 24, 2011
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Hello guys! I have a homework in DC Circuits and I need to submit it tomorrow but I don't think I do not have much time if I do it alone since I still got a lot of homeworks to do for my major subjects. So if anyone can help me, I am willing to pay someone who can give me a step-by-step solution for this problem. I really need to get this done. Here's the problem:

Solve the voltages between each of the nodes (Va, Vb, Vc, and Vd) and ground in the figure shown.

(image attached)

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Apr 20, 2004
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3. ### pmendz2010 Thread Starter New Member

Mar 24, 2011
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Uhmm.. Sorry but I don't think you are getting the point right.

4. ### beenthere Retired Moderator

Apr 20, 2004
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Our policy on homework starts with -
We must insist that you show work.

5. ### pmendz2010 Thread Starter New Member

Mar 24, 2011
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Yep! I am fully aware of that and I did try solving the problems and I finished all of it except this one. I'm kinda new to DC Circuits and I am quite stuck in this one problem. Unfortunately, I think I am running out of time so I asked for help in this forum.

I am sorry if I am causing you trouble. Thanks for the help though.

6. ### pmendz2010 Thread Starter New Member

Mar 24, 2011
8
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After combining R1 & R3, and R2 & R4, what am I supposed to do with the wire below R7 and R8?

7. ### beenthere Retired Moderator

Apr 20, 2004
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Kinda looks like a 0 ohm resistor in parallel.

8. ### pmendz2010 Thread Starter New Member

Mar 24, 2011
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I see. So the voltage there is also 0. Is it safe if I just neglect that wire and continue solving as if that wire isn't there?

9. ### beenthere Retired Moderator

Apr 20, 2004
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As if those two resistors aren't present.

10. ### pmendz2010 Thread Starter New Member

Mar 24, 2011
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Are you referring to R7 and R8? But how would I solve for the voltages between the nodes and the ground if those two resistors are neglected?

11. ### beenthere Retired Moderator

Apr 20, 2004
15,815
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They are shorted by the wire. They have no effect.

12. ### Georacer Moderator

Nov 25, 2009
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beenthere are you sure the resistors R7 and R8 are to be neglected? The way I see it, the order of the simplifications is:

Ra=R1//R3
Rb=R2//R4
Rc=R5//Ra
Rd=R6//Rb
Re=Rc//Rd
Rf=R7//R8
Rtot=Rf+Re

Can you have another look?

13. ### beenthere Retired Moderator

Apr 20, 2004
15,815
283
Yes, I did not see the lack of a connector dot between R7, R8 and ground.

14. ### pmendz2010 Thread Starter New Member

Mar 24, 2011
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Sorry but what does that mean?

15. ### beenthere Retired Moderator

Apr 20, 2004
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283
It means that I walked into a trick school problem.

The resistor net is redrawn per the attachment. There is an interesting connection missing.

Note to self: never assume a school problem is supposed to represent anything in the real world.

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16. ### pmendz2010 Thread Starter New Member

Mar 24, 2011
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Sorry for the bother but I'm a bit confused with simple things and I need clarification.

Consider the image attached, what would be the value of V1 (voltage across R1)?

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17. ### Georacer Moderator

Nov 25, 2009
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Can any voltage be produced on the same node of a circuit?
The two ends of the resistor are essentially the same point in the circuit, and voltage is defined as the difference of potential energy between two points of the circuit.