Direct current circuit

I've attached the problem in this post, so that's way yall can see the problem and picture easily.

3. The Attempt at a Solution

what is this signal $$\sum$$ means in the problem?
THe problem said they find the ammeter in the cirucuit read 2A, I just wonder is it the total current?
If i set up I = I1 + I2, then in loop 1 (top loop) I can use I and I1 to; and in loop 2(bottom loop) I can use I and I2 in order to find the currents. Is it correct? Please give me a hint. Thank you!!

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mgb_phys
Homework Helper
The symbol is a capital Sigma, it generally means sum of ( ie add them all up )
ps - You don't seem to have attached the picture properly

Thanks. I did fixed the picture. Can anyone please help me out?

define the potential to the point to the right of the ammeter to be 0.
call the potential to the left of th 5 ohm resistance U.
What must U be to make the current through the ammeter equal to 2A?
Once you have U you can calculate I_1 and the use kirchhof's current law to get I_2

Go around the bottom loop and go around the top loop using Kirchoff's loop law, then find I3 through the ammeter in terms of I1 and I2. 3 equations and 3 unknowns.

I want answer for questions, wuold you help mme?

Defennder
Homework Helper
Unfortunately no one can give you the answer, per PF rules. Show your work and we'll help you if you have problems.