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Math Help - Unit Conversion

  1. #1
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    Unit Conversion

    Have a couple problems I'd like to ask to check...

    Given the following, solve for E:
    I=2.00 A,
    R=28.0 V/A,
    r=0.500 V/A

    I=\frac{E}{R+r}

    Work done.


    \frac{R+r}{1}\cdot I=\frac{E}{R+r}\cdot\frac{R+r}{1}

    R+r\cdot I = E

    Answer: 28 V; believe I did something incorrectly.
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  2. #2
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    Quote Originally Posted by pychon View Post
    Have a couple problems I'd like to ask to check...

    Given the following, solve for E:
    I=2.00 A,
    R=28.0 V/A,
    r=0.500 V/A

    I=\frac{E}{R+r}

    Work done.


    \frac{R+r}{1}\cdot I=\frac{E}{R+r}\cdot\frac{R+r}{1}

    R+r\cdot I = E

    Answer: 28 V; believe I did something incorrectly.
    E = I(R+r)
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  3. #3
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    Thanks, those orders get me
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  4. #4
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    Another...

    A=\frac{1}{2}(a+b)h

    correct?

    h=\frac{2A}{a-b}
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