Please explain super position theorem

[Togo]

Hi. Here is the paper which we were given an answer to in class but I failed to take it down. I was too busy trying to understand it. What a useless class. Anyways, I am trying to remove all the power sources except for the 40 volt in the middle, but can't tell which direction the currents are supposed to travel.

Because once you determine polarities you add them up algebraically right? Please give me a hand, thanks.

Question #1

 

[rob_croxford]

Take a look at this site - i used while i was studying and found it very usefull.

http://www.allaboutcircuits.com/vol_1/chpt_10/7.html

 

[lexroxas]

As in the voltage source case, a current source already has a current flow. Therefore, you can only "assume" a voltage polarity of your choice. Now, you can combine that with the voltage polarity of the batteries.