When a person\'s heart undergoes ventricular fibrillation - a rapid, uncoordinat

Question

When a person's heart undergoes ventricular fibrillation - a rapid, uncoordinated twitching of the heart muscles - it often takes a strong jolt of electrical energy to restore the heart's regular beating and save the person's life. The device that delivers this jo0lt of energy is known as a defibrillator, and it uses a capacitor to store the necessary energy. In a typical defibrillator, a 175 micro-Farad capacitor is charged until the potential difference between the plates is 2240 V. a) What is the magnitude of the charge on each plate of the fully charged capacitor? _______________C b) Find the energy stored in the charged-up defibrillator. __________________J

Explanation / Answer

V =2240 V , C =175 uF

(a) Q = VC

Q = 2240*175*10^-6

Q =0.392 C

(b) U = (1/2)CV^2

U = 0.5*175*10^-6*2240*2240

U =439.04 J

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