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Giancoli 7th Edition textbook cover
Giancoli's Physics: Principles with Applications, 7th Edition
18
Electric Currents
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18-2 and 18-3: Electric Current, Resistance, Ohm's Law
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18-4: Resistivity
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18-5 and 18-6: Electric Power
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18-7: Alternating Current
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18-8: Microscopic View of Electric Current
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18-10: Nerve Conduction
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Question by Giancoli, Douglas C., Physics: Principles with Applications, 7th Ed., ©2014, Reprinted by permission of Pearson Education Inc., New York.
Problem 1
Q

A current of 1.60 A flows in a wire. How many electrons are flowing past any point in the wire per second?

A
1.00×1019 electrons1.00 \times 10^{19} \textrm{ electrons}
Giancoli 7th Edition, Chapter 18, Problem 1 solution video poster
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VIDEO TRANSCRIPT

This is Giancoli Answers with Mr. Dychko. Current is the amount of charge that passes a certain point divided by the time it takes for all those charges to pass. So we can multiply both sides by t to solve for Q. So Q is current times time, 1.6 amps times 1 second, which is 1.6 Coulombs. To figure out the number of electrons that 1.6 Coulombs represents, we multiply it by 1 electron for every 1.6 times 10 to the minus 19 Coulombs, and this gives us a total of 1.00 times 10 to the 19 electrons.

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Giancoli Answers, including solutions and videos, is copyright © 2009-2024 Shaun Dychko, Vancouver, BC, Canada. Giancoli Answers is not affiliated with the textbook publisher. Book covers, titles, and author names appear for reference purposes only and are the property of their respective owners. Giancoli Answers is your best source for the 7th and 6th edition Giancoli physics solutions.