I need to determine the current across the 4 ohm resistor (name it I1).
What I calculated, thought out so far :
- Current of 2 ohm resistor : I=5V/2ohm=2,5A. I Think this current is flow towards the A point (because the current and voltage direction is always the same on passive components, is it true?)
- The currents on the A point is : 5A+2,5A=7,5 A comes in , and 3.5 flows out. 7,5A-3,5A=4A
- This means 4A needs to flow out from the A point , i think it's flow toward the one ohm resistor.
- Voltage on 1 ohm resistor is U=4A*1ohm=4V
I cannot calculate from there the current through the 4 ohm resistor.