An automotive battery is rated at 120 A-h. This means that under certain test conditions it can output 1 A at 12 V for 120 h (under other test conditions, the battery may have other ratings).
a. How much total energy is stored in the battery?
b. If the headlights are left on overnight (8 h), how much energy will still be stored in the battery in the
morning? (Assume a 150-W total power rating for both headlights together.)
Known quantities:
Rated discharge current of the battery; rated voltage of the battery; rated discharge time of the battery.
Find:
a) Energy stored in the battery when fully charged
b) Energy stored in the battery after discharging
Analysis:
b) Assume that 150 W is the combined power rating of both lights; then,
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