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15 March, 05:16

Occasionally, the electric circuit that produces a coordinated pumping of blood from the four chambers of the heart becomes disturbed. Ventricular fibrillation can occur-random muscle contractions that produce little or no blood pumping. To stop the fibrillation, two defibrillator pads are placed on the chest and a large current (about 20 amps) is sent through the heart, restarting its normal rhythmic pattern. The current lasts 5 ms and transfers 200 J of electric energy to the body. Find the potential difference between the defibrillator pads. Express your answer with the appropriate units.

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  1. 15 March, 07:17
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    potential difference between the defibrillator pads = 2000 V

    Explanation:

    We are given;

    Current; I = 20A

    Time; t = 5 m. s = 5 x 10^ (-3) s

    Electrical energy; W = 200 J

    Now let's find the value of the electric charge from the formula;.

    q = It

    Where q is charge, I is current and t is time.

    Thus; q = 20 x 5 x 10^ (-3)

    q = 0.1 C

    Now, the potential difference between the defibrillator pads would be calculated from;

    V = W/q

    Where V is potential difference and W and q are as stated earlier.

    Plugging in the relevant values gotten earlier, we have;

    V = 200/0.1

    V = 2000 V
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