Plotting the wave forms of i(t), Vo(t) and Vi(t) when given charge vs time graph

Discussion in 'Homework Help' started by jamescolt, Sep 20, 2010.

  1. jamescolt

    Thread Starter New Member

    Sep 19, 2010
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  2. Georacer

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    Nov 25, 2009
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    In your circuit, a great length of wire is depicted. Does the problem state its resistivity (specific electrical resistance)?

    P.S. Please use the built-in picture attach tool that the forum provides. It gives better accessibility to the images.
     
  3. jamescolt

    Thread Starter New Member

    Sep 19, 2010
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    Oh yes there is, I forgot to add the info.

    In Figure 1, the voltage vi(t) is transferred to the load through a 100-ft copper transmission line. The diameter of the transmission line is 0.032 cm and its resistivity at 20 ⁰C is 1.723 μΩ.cm. Figure 2 shows one period of the electrical charge passing through this line. Neglecting the temperature effect.

    I got about 6.5 Ohms as the resistance.

    Oh sorry, will do next time.
     
  4. Georacer

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    Nov 25, 2009
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    The first step is to calculate the resistance of the line (the long cable). After that the rest is just formulas:

    i(t)=V_i(t)/R_{tot} \\<br />
and\ V_o(t)=i(t) \cdot R \\<br />
where\ R_{tot}=R+R_{line}

    Is that clear?
     
    Last edited: Sep 20, 2010
  5. jamescolt

    Thread Starter New Member

    Sep 19, 2010
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    Yeah now it is. Thaanks a lot.
     
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