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Thread: Help solving RL circuit equation

  1. #1
    May 2009

    Help solving RL circuit equation

    Hi Guys really stuck on this one and need a bit of guidance as how to proceed!

    (See attachment)
    Q1 a, Determine I1,I2and I3 after 5 time constants
    b, when the switch is first closed ie t=0
    c,when the switch re opens

    im not sure how to calculate the currents in the loop with an inductor in the circuit ?

    i=I[1-e --RL/L]

    i havnt practiced any circuits with resitance in series and parallel just looking for a way forward on how to write the equations down for each one
    with the circuit initially closed i imagine its basic kirchoffs laws to calculate I1,2 and 3 but these will be very small as almost all of the supply voltage is going to the inductor but after 5 time constants at 63.2% steady state the current values will increase

    any help appreciated

    regards Ian
    Attached Thumbnails Attached Thumbnails Help solving RL circuit equation-rlc-circuit.bmp  
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