Circuit Question, in screenshot

Question

thefurball · Answer

http://prntscr.com/cf1rrb

raffle_snaffle · Answer

Apply KVL.

thefurball · Answer

To which part?

thefurball · Answer

Could you walk me through it @raffle_snaffle ? Thanks!

raffle_snaffle · Answer

Yeah I can try... I am going to have to think about it. It has been sometime. @mathmate jump in whenever you want.

mathmate · Answer

raffle_snaffle
Haha, I don't even know where the source is.  The one at the bottom looks like a ground.  And I am used to measuring currents in series with resistors, and it shows in parallel.
I have to think about it, at the very least.

raffle_snaffle · Answer

I would make node 1 at the junction point where 5 amps leave, 15 ohm, and 2, 3 ohm branches off. Make node 2 above 4 ohm. You agree that voltage across the 4 ohm is the same as the voltage across the other wire that shows the 2 amps?

raffle_snaffle · Answer

Voltage is the same in a parallel circuit.

raffle_snaffle · Answer

Now apply node voltage law.

raffle_snaffle · Answer

Do you follow. Let me upload an image.

raffle_snaffle · Answer

attachment

raffle_snaffle · Answer

positive if current is leaving a node, negative if it's entering a node.

raffle_snaffle · Answer

https://www.youtube.com/watch?v=b3VNHh7Rrw4 Here is a good example.

raffle_snaffle · Answer

You can decide the signs as long as you stay consistent.

thefurball · Answer

thanks so much!

raffle_snaffle · Answer

No problem. I am glad I was able to help. =)