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1 February, 09:16

The capacity of a storage battery, such as those used in automobile electrical systems, is rated in ampere-hours (A? h). A 50 A? h battery can supply a current of 50 Afor 1.0 h, or 25 A for 2.0 h, and so on. A) What total energy can be supplied by a 13V, 60A? h battery if its internal resistance is negligible? Answer = ... JB) What volume (in liters) of gasoline has a total heat of combustion equal to the energy obtained in part (a) ? (See Section 17.6; the density of gasoline is 90 kg/m 3.) Answer = ... LC) If a generator with an average electrical power output of 0.45 kW is connected to the battery, how much time will be required for it to charge the battery fully? Answer = ... h

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  1. 1 February, 09:46
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    Answer: (A) 780J

    (B) 1.89*10^-11L

    (C) 1.67*10^-4 h

    Explanation:

    Energy of the battery = IVt

    =13*60 = 780J

    Heat combustion of

    1g of gasoline relax 46000J

    Therefore 780J will release 780/46000

    = 0.017g

    Density = mass/volume

    Volume = mass/density

    Volume = 0.017 * 10^-3 / 900

    = 1.89 * 10^-8 m3

    = 1.89*10^-11 litres

    P=IVt

    t=P/IV

    = 450/60*13

    1.67*10^-4 hours
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