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Ground circuit and kirchhoff law(holiday 27.30)

  1. Jun 27, 2016 #1
    1. The problem statement, all variables and given/known data
    I attatched my question as a picture

    2. Relevant equations


    3. The attempt at a solution
    1.i found a solution using kirchhoff law, V1=-11V,V2=-9V
    and it was correct. but i`m not sure that my method was right.
    i know that kirchhoff law is originated from charge and energy conservation but in the problem there is a circuit which is grounded, so i think that charge can in and out through it. consequently, charge doesn`t have to conserve in circuit.
    can i use kirchhoff law in this problem? and why?


    2.i found that current go to ground is 0 using kirchhoff law. but i don`t know why it is

     

    Attached Files:

  2. jcsd
  3. Jun 27, 2016 #2
    If you see the ground and electrical circuit is an isolation system. V at ground =0. On the other hand, the ground doesnt create works.
     
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