Car batteries are often rated in amp-hours. This rating indicatesthe quantity of

Question

Car batteries are often rated in amp-hours. This rating indicatesthe quantity of charge that can pass through the battery before thebattery's chemical energy must be restored by the car's generatoror some other source. The amp-hour unit is convenient for simplecalculations. For example, a 60-amp-hour battery can supply acurrent of 1.0 A for 60 h (or 60 A for 1.0 h) before going dead.Find the energy stored in the following. (a) a 59 A-h,10 V car battery
1 J

(b) a 1.2 A-h, 1.7 V flashlight battery
2 J (a) a 59 A-h,10 V car battery
1 J

(b) a 1.2 A-h, 1.7 V flashlight battery
2 J

Explanation / Answer

   Energy   E   =   Votage* current * time    a.   59 A-h, 10 Vbattery       E10   =   10* 59 * 3600         (1 h   =   3600 s)                =   2.124* 106   J    b.   1.2 A-h,1.7   V          E1.7   =   1.7* 1.2 * 3600                   =   7.344* 103   J

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