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Electricity 12th Grade

  1. Nov 17, 2008 #1
    1. The problem statement, all variables and given/known data

    The Problem Statement :

    All resistances are equal and worth to 360 ohm

    1°)We set between A et B a source of tension E ; [tex]E=U_A_B=12 volts[/tex],
    Determine the intensities of the current in all resistances in this electric circuit.

    2°)Take again question 1 but this time the source of tension is setted between A and D

    3°) Take again question 1 and 2 the source of tension is replaced by a current source delivering an intensity of 20 milliamperes.

    The electrical circuit for solve this problem :

    [​IMG][/URL][​IMG][/IMG]






    2. Relevant equations

    I Haven't idea because I don't understand this lesson. I want absolutely that anyone help me please.



    3. The attempt at a solution

    I need Help because tomorow I Have test but I don't understand this exercise. Thank You
     
  2. jcsd
  3. Nov 18, 2008 #2
    Problems like that can always be solved with 2 Kirchhoffs Laws. Define currents across resistances as I1, I2... and the total current I. Then use V=IR. and Kirchhoff's Laws to get a number of equations for currents, which you can solve simultaneously.
    This always works.
    But there are some other methods, e.g. considerations of symmetry, or Thevenin, Norton theorems.. etc
     
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