# Simplifying circuit

[ 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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NascentOxygen
Staff Emeritus
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?

true its equal to i1 + i2

But I have a problem where its not clear

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NascentOxygen
Staff Emeritus
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?

NascentOxygen
Staff Emeritus
But I have a problem where its not clear
What things have you explored in simplifying this next arrangement?

CWatters
Homework Helper
Gold Member
Have you studied Kirchhoff's Current Law?

[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

NascentOxygen
Staff Emeritus