< Mentor Note -- thread moved to HH from the technical physics forums, so no HH Template is shown > Hi, I was working on a the source transformation and i got to the part where there are two current sources in the circuit. The current sources were added together (giving they were going in the same direction). This is the part that confused me. 1. Was KCL done at the common node on the top to get the sum of the two current sources?? if so we didnt account for the current of R1 & R2? How can we just add two sources ( i know they are going in the same direction) and ignore the rest of the components? 2. On one of the posts that i read stated, In series the voltage would add and in parallel the current will add? Please provide explanation/derivation as i'm confused. thank you!