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Finding the missing Resistor of a circuit

Discussion in 'Electronics Homework Help' started by deniedyou, Mar 22, 2011.

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  1. deniedyou


    Mar 22, 2011
    Hi i have two questions that i really need help with

    i have a series diagram which is like this:

    Vs = 24 V
    R1 = 2 ohm
    R2 = 4 ohm
    R3 power = 24 W
    what is the value of R3 resistor?

    please if u can explain in details step by step it would be helpful thank you

    2nd question :

    R1 = 2ohm
    R2 = 4 ohm
    R3 power = 24 W
    Is = 19 A
    Vs = not given

    what is the value of R3 resistor?

    thank you
  2. davenn

    davenn Moderator

    Sep 5, 2009
    hi, welcome to the forums

    ok here's a great www site for working out voltages across resistors in series
    you can use examples there to work out unknown battery voltage current in a cct etc

    have a read and apply the formulas to your values and see how you go then ask a few more questions here on anything yoou dont understand :)

  3. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

    Jan 21, 2010
    I would try the second one first. It seems to b a simple application of the appropriate formula that you should have on the tip of your tongue (involving power, current and resistance).
  4. lexroxas


    Apr 15, 2011
    All you need to find the answers to your question is to study "Ohm's Law". It's all in there.
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