Ventricular fibrillation is a serious cardiac arrhythmia that can quickly become fatal. Fibrillation

Ventricular fibrillation
is a serious cardiac arrhythmia that can quickly become fatal. Fibrillation
happens when contraction of individual cardiac muscle cells is not synchronized.
A short, strong current can be applied to defibrillate the heart and throw the
cells back into sync.

(a) For patients at high
risk of tachycardia and fibrillation, implantable car-dioverter-defibrillators
(ICDs) can be put inside the body to provide quick treatment if needed. ICDs
often contain capacitors. An ICD contains two identical capacitors, each with a
capacitance of 200mF and a maximum energy storage
»

Ventricular fibrillation
is a serious cardiac arrhythmia that can quickly become fatal. Fibrillation
happens when contraction of individual cardiac muscle cells is not synchronized.
A short, strong current can be applied to defibrillate the heart and throw the
cells back into sync.

(a) For patients at high
risk of tachycardia and fibrillation, implantable car-dioverter-defibrillators
(ICDs) can be put inside the body to provide quick treatment if needed. ICDs
often contain capacitors. An ICD contains two identical capacitors, each with a
capacitance of 200mF and a maximum energy storage capacity of 75 J. What is the
maximum voltage that can be applied to one of the capacitors?

(b) The energy stored in
the capacitors may not completely be delivered to a patient because the system
is not ideal (e.g., there are losses along the circuit and at the electrodes).
If you need only 750 V to shock the heart back into synchronization, what would
the minimum efficiency of the ICD in part (a) have to be?

 

»

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