(This question has been modified from The College Board’s Energy Primer for APES Students)
Batteries are usually rated in terms of ampere-hours, indicating the current that the cell is capable of delivering for a specified time. A typical AA flashlight battery, for instance, might be rated at 2.8 ampere-hours. The total electrical energy available from such a battery is found by multiplying the ampere-hour rating by the battery voltage. Thus this same 1.5 volt AA battery could deliver 4.2 watt-hours of electrical energy.
Convert this energy to kWh and compare the cost of electrical energy derived in this manner to that of standard “grid-based” electricity. Assume that the battery costs $0.50 and that electricity from the power company is available at $0.12/kWh.
In order to answer, type out your work.