Nodal analysis and mesh method

[Kidi3]

I currently studying to become an electrical engineer, but feel it's kinda difficult.

I currently trying to train my skills in analyzing a Electric circuit using the node analysis and mesh method.

But the answers I get isn't the same as the one giving.

[url]http://personal.georgiasouthern.edu/~ralba/SPRING2011/LEC/teet2143-lec/exercises-quiz3-mesh-nodal-w-ans.pdf
[/url]

I tried calculating Exercise 1 and 5 using Node analysis.

these are my calculations for exercise 1
http://snag.gy/Rfcp7.jpg

And these are my calculations for excersice 5
Har også lige prøvet opgave 5

For V1 = 12v

V2 = -2V



I1 =6+(-3) = 3A

V1 = 12V

I2 = -1A

-1 * 2 = -2V...