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If $1.80\times 10^{20}$ electrons move through a pocket calculator during a full day's operation, how many coulombs of charge moved through it?
Question by OpenStax is licensed under CC BY 4.0.
$-28.8\textrm{ C}$
Solution Video

OpenStax College Physics for AP® Courses Solution, Chapter 18, Problem 2 (Problems & Exercises) (0:26)

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Video Transcript
This is College Physics Answers with Shaun Dychko. 1.80 times 10 to the 20 electrons flow through a calculator during the day and we want to know what that charge is in coulombs? So we multiply the number of electrons by negative 1.60 times 10 to the minus 19 coulombs for each electron and the electrons cancel leaving us with units of coulombs that is negative 28.8 coulombs.