Negative time constant?

Discussion in 'Homework Help' started by xfollowthereaperx, Jan 12, 2012.

  1. xfollowthereaperx

    Thread Starter New Member

    Jan 11, 2012
    4
    0
    Doing a prelab and my time constant and back resistance on diode don't seem correct. The work is in attachments, variables are as follows:

    i_c=2.0 A at t=0+
    V_c=-10 V at t=0
    V_c=-5 V at t=250sec

    Answers are as follows:

    L= 0.25mH
    \tau= -360.7
    R= -36.07*10^6 ohms

    My concern is that my tau and R are negative numbers.
     
    Last edited: Jan 12, 2012
  2. xfollowthereaperx

    Thread Starter New Member

    Jan 11, 2012
    4
    0
    Found my mistake

    -5/-10 = 1/2

    I blame learning binary!
     
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