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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

    deniedyou

    1
    0
    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

    13,984
    2,015
    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 :)

    http://www.tpub.com/neets/book1/chapter3/1-12.htm

    cheers
    Dave
     
  3. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

    25,505
    2,849
    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

    lexroxas

    37
    0
    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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