Battery-powered electricity is very expensive compared with that available from a wall
Chapter 18, Problem 18.88(choose chapter or problem)
Battery-powered electricity is very expensive compared with that available from a wall receptacle. Estimate the cost per kWh of (a) an alkaline D-cell (cost $1.70) and (b) an alkaline AA-cell (cost $1.25). These batteries can provide a continuous current of 25 mA for 820 h and 120 h, respectively, at 1.5 V. (c) Compare to the cost of a normal 120-V ac house source at
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