7. a. In a car electrical system, the capacity of a storage battery is rated in ampere- hours (A-hr). A 100 A-hr battery can supply a current of 100 A in one hour, or 50 A for two hours, and so on. What total energy is stored in a 12-V, 100 A-hr battery if its internal resistance is negligible? How much gasoline (in liters) has a total heat of combustion equal to the total energy? Take the heat of combustion of gasoline to be 46 MJ/kg and its density to be 900 kg/m³.

7. a. In a car electrical system, the capacity of a storage battery is rated in ampere- hours (A-hr). A 100 A-hr battery can supply a current of 100 A in one hour, or 50 A for two hours, and so on. What total energy is stored in a 12-V, 100 A-hr battery if its internal resistance is negligible? How much gasoline (in liters) has a total heat of combustion equal to the total energy? Take the heat of combustion of gasoline to be 46 MJ/kg and its density to be 900 kg/m³.

University Physics Volume 2

18th Edition

ISBN:9781938168161

Author:OpenStax

Publisher:OpenStax

Chapter10: Direct-current Circuits

Section: Chapter Questions

Problem 25P: A 12.0-V emf automobile battery has a terminal voltage of 16.0 V when being charged by a current of...

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