When a certain 1.5-V battery is used to power a 3-W flashlight bulb, it is dead after
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When a certain 1.5-V battery is used to power a 3-W flashlight bulb, it is dead after an hour’s use. If the battery costs $0.50, what is the cost of a kilowatt-hour of electric energy obtained in this way? How does this compare with the cost of electric energy supplied to your home?
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