A heart defibrillator is used to enable the heart to start beating if it has stopped. This is done by passing a large current of 12.0 A thro

Question

A heart defibrillator is used to enable the heart to start beating if it has stopped. This is done by passing a large current of 12.0 A through the body at 25.0 V for a very short time, usually about 3.00 ms.

(a) What power does the defibrillator deliver to the body?
(b) How much energy is transferred?

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Trúc Chi 4 years 2021-09-04T01:51:31+00:00 1 Answers 101 views 0

Answers ( )

  1. Sigrid
    0
    2021-09-04T01:52:43+00:00
    Reply

    To solve this problem we will apply the concepts related to Power, such as the product of voltage and current. Likewise, Power is defined as the amount of energy per unit of time, therefore, using this relationship we will solve the second part.

    PART A)

    We know that Power is,

    P = VI

    Substitute 25.0V for V and 12.0 A for I in the expression,

    P=(25.0V)(12.0A)

    P = 300W

    Therefore the power deliver to the body is 300W

    PART B) Converting the time to SI,

    t = 3ms = 0.003s

    Therefore if we have that the expression for energy is,

    P = \frac{E}{t} \rightarrow E = Pt

    Here,

    E = Energy,

    P = Power,

    t = Time,

    Replacing,

    E = (300W)(0.003s)

    E = 0.9J

    Therefore the energy transferred is equal to 0.9J

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