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Determine the current at start-up and the battery discharged

  1. Jun 25, 2009 #1
    A discharged battery is charged through connection with a charged battery of another car with direct cable connection. Determine the current at start-up and the battery discharged
     

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  2. jcsd
  3. Jun 25, 2009 #2
    Re: Battery

    It is corret:

    R1*I1 + R2 * I2 + E2 + E1 = 0
    0,01I1 + I2 -10 +12 = 0
    I2 = -0,01I1 -2


    R3*I1 = E2 + R2*I2
    0,06I1 = -10 + I2
    I2 = 0,06I1 + 10


    0,06I1 + 10 = -0,01I1 - 2
    0,07I1 = -12
    I1 = -171,42 A

    I2 = -0,2858A


    I1 => current at start-up
    I2 => current battery discharged

    Correct ?
     
  4. Jun 25, 2009 #3

    ideasrule

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    Re: Battery

    What's your justification for assuming that the current through R3 is the same as that through R1?
     
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