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Math Help - Electrical Circuits? - Resistance, ohms, amperes

  1. #1
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    Electrical Circuits? - Resistance, ohms, amperes



    Anyone have a clue on how to solve for the X's?????
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  2. #2
    Senior Member Peritus's Avatar
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    2.


    first let us find the equivalent resistance of the 3 resistors:

    Rt = (1/15 + 1/15 + 1/15)^-1 = 5 ohm

    now using ohms law we know that:

    x / Rt = 2.5 ---> x = 12.5 [v]

    3.

    again using the same strategy, we first find the equivalent resistance of the circuit:

    Rt = 5 + x/2

    now using ohms law we know that:

    24 / (5+x/2) = 1.5

    <=> 16 = 5+x/2
    <=> x = 22 [ohm]
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  3. #3
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    Could you go over this part?

    24 / (5+x/2) = 1.5

    <=> 16 = 5+x/2
    <=> x = 22 [ohm]

    How do you get from the 1st equation to the 16 = 5+x/2

    and how do you get x = 22....

    5+x/2 = 16 so 5+x would = 32 and then x would equal 27
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  4. #4
    Senior Member Peritus's Avatar
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    I didn't use parentheses so maybe that's what confused you:

    16 = 5+(x/2)
    <=> 11 = x/2
    <=> x = 22
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