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What is a defibrilator ? Explain briefly. |
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Answer» Solution :A defbrilator is a device used to save the life of a person suffering a heart stroke. DUE to rapid, unco - ordinated twitching of the heart muscles , the heart undergoes ventricular fibrillation.To save the person's life, regular beatingof the heart is to be restored by deliveringa jolt to the heart USING a DEFIBRILLATOR. Suppose a `70 mu F` a capacitorof a defibrillator is chargedto a potentialof 5000V. The energy stored `= (1)/(2) CV^(2) = (1)/(2) (70xx10^(-6)) (5000)^(2) J = 875 J`. Typically about 200J of energyis allowedto passthroughperson's body in a pluselasting2 milli second. THEREFORE, power deliverd to the body `(200)/(2xx10^(-3)) = 10^(5) W = 100 kW`, which is much largerthan thepowerdelivered by the battery. Thus energystoredin the capacitordischargedat a muchhigherpower providesthe much neededjolt to savethe person's life. |
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