Math formulas solve for r?

I=2V/R+2r

3 Answers

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  • mizoo
    Lv 7
    6 years ago
    Favorite Answer

    I = (2V/R) + 2r

    I - (2V/R) = 2r

    r = (1/2) * [I - (2V/R)]

    r = (I/2) - (V/R)

    But if you meant to write I = 2V / (R+2r),

    I * (R + 2r) = 2V

    IR + 2rI = 2V

    2rI = 2V - IR

    r = (2V - IR) / 2I

    r = (V/I) - (R/2)

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  • 6 years ago

    I=2V/R+2r

    =2r=I-2V/R

    r=(1-2v/r)/2

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  • 6 years ago

    ambiguous, I'll assume this is

    I = (2V/R) + 2r

    I'll also assume R is not the same as r

    2r = I – (2V/R)

    r = (I/2) – (V/R)

    of course it could be

    I = 2V/(R + 2r)

    I(R + 2r) = 2V

    R + 2r = (2V / I)

    2r = (2V / I) – R

    r = (V/ I) – (R/2)

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