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Energy is dissipated

  1. Feb 25, 2009 #1
    1. The problem statement, all variables and given/known data
    A defibrillator passes a brief burst of current through the heart to restore normal beating. In one such defibrillator, a 40.0 µF capacitor is charged to 6.2 kV. Paddles are used to make an electrical connection to the patient's chest. A pulse of current lasting 1.0 ms partially discharges the capacitor through the patient. The electrical resistance of the patient (from paddle to paddle) is 230 .
    I found these calculations:

    initial energy stored in the capacitor is 768.8J
    initial current through the patient is 26.96A

    I need to know How much energy is dissipated in the patient during the 1.0 ms?


    2. Relevant equations



    3. The attempt at a solution
     
  2. jcsd
  3. Feb 25, 2009 #2
    any attempts???
     
  4. Feb 25, 2009 #3
    Try this if ur given values 768.8J and 26.96 are right:


    • Charge remaining after t s., Q = CV e^ -[1/CR]t


    • Energy lost = 768 – Q^2 / 2C
     
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