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Math Help - d.c circuits

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    d.c circuits

    The circuit shows a 10kohm potentiometer with a 5kohm load. Determine the position of the slider on the "pot" when the voltage across the point "xx" is 3v? ImageShack® - Online Photo and Video Hosting
    Any help greatly received as I am really struggling with this. Thanks
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    Re: d.c circuits

    Quote Originally Posted by Jock View Post
    The circuit shows a 10kohm potentiometer with a 5kohm load. Determine the position of the slider on the "pot" when the voltage across the point "xx" is 3v? ImageShack® - Online Photo and Video Hosting
    Any help greatly received as I am really struggling with this. Thanks
    You have two resistors in parallel, the 5 kOhm and R (from the potentiometer.) You know, then, there is a 3 V potential difference across the 5 kOhm resistor as well as 3 V across the R. You also know that the currents in a parallel circuit are additive. So....
    3 = I_1 \cdot 5

    3 = I_2 R

    9 = I R_{eq}
    where this last is for the circuit as a whole. (Recall I = I_1 + I_2)

    Three equations, three unknowns...

    -Dan
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