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Math Help - plot of a function of time

  1. #1
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    plot of a function of time

    a matlab question..

    A resistor, R = 4 ohms, and an inductor, L = 1.3H, are connected in a circuit to a voltage source as shown in Figure (a) (RL circuit). When the voltage source applies a rectangular voltage pulse with an amplitude of V = 12V and a duration of 0.5 s, the current i(t) in the circuit as a function of time is given by: http://img255.imageshack.us/img255/5031/untitledva1.png

    make a plot of the current as a function of time for 0 <= t <= 2 s.


    my question is, which equation do I use, there appears to be two?

    thanks for any help.
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  2. #2
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    Quote Originally Posted by rcmango View Post
    a matlab question..

    A resistor, R = 4 ohms, and an inductor, L = 1.3H, are connected in a circuit to a voltage source as shown in Figure (a) (RL circuit). When the voltage source applies a rectangular voltage pulse with an amplitude of V = 12V and a duration of 0.5 s, the current i(t) in the circuit as a function of time is given by: http://img255.imageshack.us/img255/5031/untitledva1.png

    make a plot of the current as a function of time for 0 <= t <= 2 s.


    my question is, which equation do I use, there appears to be two?

    thanks for any help.
    You use both. The first function i(t) is for 0 s < t < 0.5 s and the second is for 0.5 s < t so you plot it "piece-wise." The result is below. (Obviously x represents t.)

    -Dan
    Attached Thumbnails Attached Thumbnails plot of a function of time-pulse.jpg  
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  3. #3
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    thanks.
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