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Question
(a) What is the average power output of a heart defibrillator that dissipates 400 J of energy in 10.0 ms? (b) Considering the high-power output, why doesn’t the defibrillator produce serious burns?
1. $4.00\times 10^{4}\textrm{ W}$
2. Power dissipated as heat in the skin is proportional to the resistance of the skin. Skin resistance is complicated - see Wikipedia article. The defibrillator voltage and frequency are such that skin resistance is reduced, which prevents the skin from dissipating heat and burning. Also, gel is put between the paddles and skin which prevents the air gap that would otherwise heat up and burn the skin.
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