Finding current in a circuit using Kirchhoff voltage law

  • #1

Homework Statement


Hi, I'm learning about Kirchhoff's laws, and have to solve the circuit. Attached picture of part the circuit I am attempting to solve. The ammeter reads 2 A.

Homework Equations


Kirchhoff's voltage law says the total voltage around a closed loop must be zero.

The Attempt at a Solution


By going around the loop I get 0 = -18V + (7 ohms)(I1) + (5 ohms)(2 A) + 3V.
Then solving for the current I1 I find that it is -0.714 A. But in the solution it does not have a negative sign. What did I do wrong?
 

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Answers and Replies

  • #2
Nathanael
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0 = -18V + (7 ohms)(I1) + (5 ohms)(2 A) + 3V.
...
But in the solution it does not have a negative sign. What did I do wrong?
Algebra mistake? Your equation gives a positive value, +5/7

But you did not even post the full circuit :\
 

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