R1=30Ω R2=20Ω R3=20Ω R4=10Ω R5=40Ω R6=10Ω I4=4A
I need to calculate U (total voltage)
schematic:
http://i43.tinypic.com/2jvbx2.png
I tried this:
R23=1/(1/10+1/20)=10ohm
R234=10+10=20ohm
R2345=1/(1/R234+1/R5)=1
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