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
18-4: Resistivity
18-5 and 18-6: Electric Power
18-7: Alternating Current
18-8: Microscopic View of Electric Current
18-10: Nerve Conduction

Question by Giancoli, Douglas C., Physics: Principles with Applications, 7th Ed., ©2014, Reprinted by permission of Pearson Education Inc., New York.
Problem 6
Q

How many coulombs are there in a 75 ampere-hour car battery?

A
2.7×105 C2.7 \times 10^5 \textrm{ C}
Giancoli 7th Edition, Chapter 18, Problem 6 solution video poster
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VIDEO TRANSCRIPT

This is Giancoli Answers with Mr. Dychko. We know that current is the number of coulombs charge that pass by a certain point in a certain amount of time, t. We can solve this for the amount of charge because the amp hours rading on a battery is current multiplied by time, but the time is an hour since we have to convert into seconds by multiplying by 3,600 seconds per hour. So we have 75 amps times 3,600 seconds which gives us the number of Coulombs, because amps is really Coulombs per second. The unit A for amps is an abbreviation for Coulombs per second. So you can see the seconds cancel here, living us with Coulombs 2.7 times 10 to the five Coulombs is the amount of charge in the battery.

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