A backup generator consumes 0.4-gal gasoline per hour when it supplies a 3.5-kW load. Determine its efficiency assuming that the calorific value of gasoline is 116,090 Btu/gal.
A 12-V 100 Amp-hour battery weighs 27 kg and has the dimensions: 22-cm, L: 30-cm, H: 17-cm. Determine its energy density and specific energy.
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