WEBVTT 00:00:00.053 --> 00:00:02.826 This is College Physics Answers with Shaun Dychko. 00:00:03.360 --> 00:00:05.413 Current is charge divided by time 00:00:05.413 --> 00:00:08.533 and we can solve this for Q by multiplying both sides by t. 00:00:09.173 --> 00:00:13.137 So the amount of charge that is discharged by the defibrillator 00:00:13.333 --> 00:00:14.960 is the current multiplied by the time. 00:00:15.164 --> 00:00:22.142 So that's 12 amps multiplied by 0.01 seconds which gives 0.120 coulombs of charge. 00:00:22.844 --> 00:00:28.435 Now the number of electrons in this 0.12 coulombs is the number of coulombs 00:00:28.435 --> 00:00:33.706 multiplied by one electron for every 1.6 times ten to the minus nineteen coulombs. 00:00:33.706 --> 00:00:35.360 This is the elementary charge. 00:00:35.982 --> 00:00:41.431 So we multiply 0.12 coulombs by this fraction 00:00:41.973 --> 00:00:45.182 which is really the same as dividing by 1.6 times ten to the minus nineteen 00:00:45.546 --> 00:00:49.271 and we get 7.50 times ten to the seventeen electrons.