WEBVTT
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This is College Physics
Answers with Shaun Dychko.
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Current is charge divided by time
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and we can solve this for *Q* by
multiplying both sides by *t*.
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So the amount of charge that is
discharged by the defibrillator
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is the current multiplied by the time.
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So that's 12 amps multiplied by 0.01 seconds
which gives 0.120 coulombs of charge.
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Now the number of electrons in this 0.12
coulombs is the number of coulombs
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multiplied by one electron for every 1.6
times ten to the minus nineteen coulombs.
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This is the elementary charge.
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So we multiply 0.12 coulombs
by this fraction
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which is really the same as dividing
by 1.6 times ten to the minus nineteen
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and we get 7.50 times ten
to the seventeen electrons.