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21 June, 22:20

A power source for a portable electrical defibrillator contains a capacitor of capacitance 60 μF. The potential difference across the plates of the capacitor is raised to 5.0x10^3 V and 20% of its stored energy is released in a 3.0 ms pulse. Calculate the average power of the pulse.

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  1. 22 June, 00:26
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    Energy of the capacitor = 1/2 C V² = 1/2 X 60 X 10⁻⁶ X 5 X 10³ = 0.15 J

    20 % =.03 J

    Power = energy released per second = Energy / time =.03 / (3 x 10⁻³) = 10 W.
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