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Homework Help: Capacitor energy problem?

  1. Feb 2, 2014 #1
    Capacitor energy problem??

    1. The problem statement, all variables and given/known data

    A capacitor in this device is charged to 6417.0 V and stores 208.0 J of energy. What is its capacitance?

    2. Relevant equations

    i know the equation but dnt know how to use it . . C=(kEoA)/d

    3. The attempt at a solution

    I don't know how to solve this question. i don't even know how to start. please help
     
  2. jcsd
  3. Feb 2, 2014 #2

    lewando

    User Avatar
    Homework Helper
    Gold Member

    Try this equation: Energy = (Capacitance*Voltage2)/2
     
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