A cell phone battery is rated at 3.85 volts and can store 10.78 watt-hours of energy.

(a) How much average current can it deliver over a period of 3 hours if it is fully discharged at the end of that time?
(b) How much average power is delivered in part (a)?
(c) What is the ampere-hour rating of the battery?


(a) Clearly 10.78 watt-hours = (voltage)(current)(time) = 3.85I(3) or I = 10.78/[(3.85)(3)] = 933.3 mA
(b) p = energy/time = 10.78/3 = 3.593 W
(c) amp-hours = energy/voltage = 10.78/3.85 = 2.8 amp-hours

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