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Math Help - Determine the current

  1. #1
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    Determine the current

    The power developed in a circuit is given by P = 10I-8I^2 where I is the current in amps. determine the current required to produce a power of 1.75 watts in th circuit.


    Many thanks.
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  2. #2
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    Hi

    You need to solve 10I-8I^2=1.75 which is a second degree polynomial equation.
    Do you know how to solve this type of equation ?
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  3. #3
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    hi there,

    Thank you for your help. I dont know how to work this out.

    Thanks again

    could you show me please?

    thanks
    Last edited by mr fantastic; February 20th 2009 at 01:00 AM. Reason: Merged posts
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  4. #4
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    Quote Originally Posted by running-gag View Post
    Hi

    You need to solve 10I-8I^2=1.75 which is a second degree polynomial equation.
    Do you know how to solve this type of equation ?
    Quote Originally Posted by Stazzer5 View Post
    hi there,

    Thank you for your help. I dont know how to work this out.

    Thanks again

    could you show me please?

    thanks
    Re-arrange: 8 I^2 - 10 I + 1.75 = 0.

    Solve using the quadratic formula.
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