Question

You get a summer job in a company that builds circuits for medical devices. You are asked to evaluate prospective designs for a defibrillator, which supplies a potential difference between 200-2000 V to a pair of paddles to be used on a patient. The defibrillator works by charging a capacitor bank, which is connected to a resistor and the paddles in a series circuit. The current delivered to the paddles needs to be such that the patient receives no more than 360 J of energy; typical defibrillator discharge takes on the order of 1 s.

What combination of capacitance and resistance allows you to build such a device?

The power rating of a resistor determines how much power it can safely dissipate before it burns out. What does the power rating of the resistor in the circuit need to be?

PLEASE SHOW ALL WORK (STEP-BY-STEP)

Answer 1

Given discharging time 1s Typically it takes 5 time constant for discharge, 5*RC-1 >RC=0.2 So this combination of capacitance and resistance will allow us to build such device. The power rating of the register Maximum energy dissipation allowed discharge 1s Power rate of energy dissipation 360J/1s = 360Watt = 360J time taken to =

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