A 4.5-V battery is connected to a bulb whose resistance is $1.3 \; \Omega$. How many electrons leave the battery per minute?

VIDEO TRANSCRIPT

This is Giancoli Answers with Mr. Dychko. Well, first, we can find the current in amps and that's gonna be voltage divided by resistance. 4.5 volts divided by 1.3 ohms gives us 3.46154 amps. And this is Coulombs per second, that's what amps is in abbreviation for. Our job is to convert this into electrons per minute. So we take this Coulombs per second multiplied by 60 seconds per minute, and that gives us the number of Coulombs per minute. Then we have to convert that into electrons by multiplying by one electron for every 1.6 times 10 to the minus 19 Coulombs and this gives us 1.3 times 10 to the 21 electrons per minute.