# Simplifying circuit

1. Dec 5, 2016

### dontwannatellyou

[ 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

Last edited by a moderator: Dec 5, 2016
2. Dec 5, 2016

### Staff: Mentor

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?

3. Dec 6, 2016

### dontwannatellyou

true its equal to i1 + i2

4. Dec 6, 2016

### dontwannatellyou

But I have a problem where its not clear

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5. Dec 6, 2016

### Staff: Mentor

[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. Dec 6, 2016

### Staff: Mentor

What things have you explored in simplifying this next arrangement?

7. Dec 6, 2016

### CWatters

Have you studied Kirchhoff's Current Law?

8. Dec 6, 2016

also I1 +I2

9. Dec 6, 2016

### Staff: Mentor

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 ).