A standard flashlight battery can deliver about 2.0 W . h
Chapter 27, Problem 6(choose chapter or problem)
A standard flashlight battery can deliver about 2.0 W . h of energy before it runs down. (a) If a battery costs US$0.80, what is the cost of operating a 100 W lamp for 8.0 h using batteries? (b) What is the cost if energy is provided at the rate of US$0.06 per kilowatthour?
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