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Parallel Series Help

Discussion in 'General Electronics Chat' started by f74bat, Nov 26, 2008.

  1. f74bat

    Thread Starter Member

    Nov 26, 2008
    13
    0
    Not sure how to combine series and parallel curcuits...

    Part 1:
    A number of resistors of values R1 = 19.0 Ω, R2 = 82.0 Ω, and R3 = 14.0 Ω are connected as shown in the figure.


    [​IMG]


    What is the resistance between points A and B?

    Part 2:
    If VAB = 115.0 V, what is the current flowing between points C and D through R2 ?​
     
  2. mik3

    Senior Member

    Feb 4, 2008
    4,846
    70
    Start form the right side of the circuit and make parallel/series combination of resistors until you will be left with a single resistors between points A and B. This will be the equivalent resistance of the network.

    For the second part, find the equivalent resistance between points C and D with the same way as before (you will already have the calculations) and then find the current through R1-Rcd(equivalent)-R1 by manipulating them as series resistors.
     
  3. f74bat

    Thread Starter Member

    Nov 26, 2008
    13
    0
    Do include R2 in the first series? And when i do the first parallel is it 8(R1)+(2/R2)+R3? Do i add all the receptors off to the side in the parallel?
     
  4. Søren

    Senior Member

    Sep 2, 2006
    472
    30
    Hi,


    This is an easy way of solving it:
    [​IMG]
    I think you should be able to do the numbers yourself now.
     
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