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Need help on college question!

Discussion in 'Electronics Homework Help' started by fleck1029, Jan 26, 2015.

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  1. fleck1029

    fleck1029

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    Jan 26, 2015
    We need to calculate the current and voltage through resistor R2 and R3, using Kirchhoff's Law and the power dissipated by R4.

    Please can someone work this question out and explain how you did it please.
     

    Attached Files:

  2. KrisBlueNZ

    KrisBlueNZ Sadly passed away in 2015

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    Nov 28, 2011
    Hi there and welcome to Electronics Point :)

    We don't give answers to homework questions - that defeats the purpose of having homework in the first place! But we will try to push you in the right direction so you can solve it yourself.

    The first thing to do is to redraw that circuit in its simplest form. Two tricks have been used to make it look more complicated than it is: R1 and R3 have been drawn in series with V1 but in different legs, and R4 and R5 have been drawn in series. In both cases these can be reduced to a single resistance.

    When you do that, you will have a circuit with three resistors and two voltage sources. Each of the voltage sources will have one resistor in series with it. Start by drawing that circuit and labelling the resistors with their original circuit references and their total resistance values.
     
  3. fleck1029

    fleck1029

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    Jan 26, 2015
    Thank you I wasn't looking for a definait answer but just help how to solve it this should help me thank you for replying so quick, if you have anymore help on how to use kirchhoff's law in this question then please feel free to explain to me, we have been given this question an even the teacher is finding it difficult to solve it
     
  4. KrisBlueNZ

    KrisBlueNZ Sadly passed away in 2015

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    Nov 28, 2011
    OK. So draw up the simplified circuit and post it, then we can analyse it using Kirchhoff's Law.
     
  5. fleck1029

    fleck1029

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    0
    Jan 26, 2015
    Is this okay?
    Or have I simplified it wrong.
     

    Attached Files:

    Last edited: Jan 26, 2015
  6. KrisBlueNZ

    KrisBlueNZ Sadly passed away in 2015

    8,393
    1,271
    Nov 28, 2011
    You've simplified it wrong. You've got the three resistor values right, but they aren't connected the right way.

    It might help if you label each resistor with its original circuit reference. Since you will be combining R1 and R3, and combining R4 and R5, the three resistors in your simplified diagram will be named "R1+R3", "R2", and "R4+R5".
     
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