Simplifying circuit

  • #1
[ Mod Note: relocated to homework forum so template is missing ]

Hi
Iwas soving a problem and the question is to simplify the circuit . Ididnt understand how the whole circuit is the same as the sum of I1 and I2 and U1 (which is a voltage source ) and I3 and R1 dont play a role
Thank you





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  • #2
NascentOxygen
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This is similar to some of our homework questions, so I'll move this to the homework forum.

Imagine there is an external load, represented by an additional resistor R (not shown) between A and B.

Looking at these sources (and their ghastly non-standard symbols) can you say how much current is leaving this circuit to flow into resistor R via the wire at A?
 
  • #4
But I have a problem where its not clear
 

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  • #5
NascentOxygen
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true its equal to i1 + i2
[We're not finished yet.]

So that's the current leaving at A and going into the top of the load resistor, R.

Next, what would be an expression for current leaving the lower end of R to reenter the circuit at point B?
 
  • #6
NascentOxygen
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But I have a problem where its not clear
What things have you explored in simplifying this next arrangement?

3-png.109993.png
 
  • #7
CWatters
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Have you studied Kirchhoff's Current Law?
 
  • #8
[We're not finished yet.]

So that's the current leaving at A and going into the top of the load resistor, R.

Next, what would be an expression for current leaving the lower end of R to reenter the circuit at point B?
also I1 +I2
 
  • #9
NascentOxygen
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also I1 +I2
So what is the voltage across the load resistor, R?

Now, as a learning exercise, deduce what must be the voltage across the top left current source (the source supplying I1 ).
 

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