- #1

patric44

- 308

- 40

- Homework Statement
- find the value of E1 that would make the reading of the ammeter = 0

- Relevant Equations
- I3 = I1+I2

E1 = 3I1 + 4I3

12 = 2I2 + 4I3

the question is find the value of E1 that would make the ammeter reading = 0 ?

i tried KCL , and KVL and got the following equations : ( I

_{1}belongs to 3 ohm , I

_{2}belongs to 2 ohm , I

_{3}belongs to 4 ohm ):

I

_{3}= I

_{1}+I

_{2}

E1 = 3I

_{1}+ 4I

_{3}

12 = 2I

_{2}+ 4I

_{3}

but now i have 3 equations in 4 variables ?!

i think its simpler than that but i am missing the idea here , any help on this ?

i saw the answer it equals 8 v , but i can't get any further with my equations .