i drew the current for i4 in the wrong direction and arrivedat the incorrect kcl

Question

i drew the current for i4 in the wrong direction and arrivedat the incorrect kcl equation of i1+i1=i3. can someone teach me the rules for knowing the right directionof currents. my prof keeps saying it doesnt matter but it reallydoes. i keep getting wrong answers. thanks all! i drew the current for i4 in the wrong direction and arrivedat the incorrect kcl equation of i1+i1=i3. can someone teach me the rules for knowing the right directionof currents. my prof keeps saying it doesnt matter but it reallydoes. i keep getting wrong answers. thanks all!

Explanation / Answer

your professor is right. it doesn't matter which way youchoose current to go as long as your consistant. you might get anegative answer meaning you did it right but go wrongdiraction... Normally the way i do it is if current is going into node thenits positive. if current is going out of the node then itsnegative.. i use this method everytime and i could never go wrong.let me know if you need more help

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