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Homework Help: Voltaje and Current Graphs

  1. Jul 5, 2009 #1
    1. The problem statement, all variables and given/known data
    In my Engineering Circuit Analysis I class im in Capacitors and Inductors where they give us the graph of either i(t) or v(t) and we have to determine the graph of current or voltage depending if it's a capacitor or inductor.

    2. Relevant equations

    For example,
    v(t)= L di/dt is the differential equation used and if you integrate it you get the current equation for the inductor.

    3. The attempt at a solution

    My question is, if you have a graph say current for a capacitor and ur asked to determine the graph of voltage for it, When cannot i not use the Geometry to determine the integration? When is that i have to use the slope-point equation to determine the line equation.?

    My professor told me that i can use 1/2 base height or base height if it was geometrically possible to agilize the problem but sometimes it wasn't that straight forward, therefore i have to determine the equation so i can integrate it.
  2. jcsd
  3. Jul 6, 2009 #2


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    Staff Emeritus
    Science Advisor
    Homework Helper

    You can use geometry to get the integral when the graph happens to be a simple geometric figure, such as a triangle or rectangle.

    If the graph is more complex in form, you would need to deal with the equation for the graph in order to get the integral.
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