Resistive Network. - nodal analysis

  • #1

Homework Statement


http://learn.lboro.ac.uk/file.php/1844/Quiz_figures/Chins_Files/Q11.jpg





In the above circuit



V1=17 Volts

V2=8.5 Volts

V3=4.25 Volts

I1= 4 Amps

I2= 5 Amps

R1=4.25 Ohms

R3=6.375 Ohms

R4=1.0625 Ohms

R5=2.125 Ohms

R6=2.125 Ohms



Calculate the following:



a) Magnitude of the current through R5:

b) The resistance R2:

a) Magnitude of the voltage across I1:


Homework Equations




The Attempt at a Solution


I am really unsure on how to start this question, any starting tips would be great please, this was a tutorial set in my college class.
Q11.jpg
Q11.jpg
 

Answers and Replies

  • #2
NascentOxygen
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Have you looked at where the given voltage V3 is located? :))
 
  • #3
what do you mean by that sorry?
 
  • #4
NascentOxygen
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You're wanting guidance to answer part (a)?
 
  • #5
I think i know how to work out Part A - Im just guessing its Voltage divided by R?
Its part b and c, that i am stuck with
 
  • #6
NascentOxygen
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I think i know how to work out Part A - Im just guessing its Voltage divided by R?
Guessing??

Its part b and c, that i am stuck with
Can you work out how many volts across R4?
Hence, determine the current through R4 .... and so on, working your way around the circuit until you have determined all parameters needed to answer the questions.
 
  • #7
Sorry I'm confused now. Would I need nodal analysis for this and convert all of these to current sources?
 
  • #8
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You do not have to convert anything, and you can do it step by step. There is no need for multiple unknowns at the same time. NascentOxygen showed you the first two steps.
 
  • #9
NascentOxygen
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Sorry I'm confused now. Would I need nodal analysis for this and convert all of these to current sources?
Just use KVL to determine the voltage across R4.

Then use Ohms Law, KCL and KVL to determine voltages and currents one by one. No formal analysis and no need for a matrix of simultaneous equations!
 

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