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How much internal energy is produced in the battery

  1. Apr 2, 2005 #1
    I do not know what to solve for...?

    One recargable battery of mass 15g delivers to a cd player an average current of 1.80mA at 1.60 V for 2.4hours before the battery needs to be recharged. The recharger maintains a potential difference of 2.30v across the battery and delivers a charging current of 13.5mA for 4.20 hours. (a) what is the efficiency of the battery as an energy storage device? (b) How much internal energy is produced in the battery during one charge - discharge cycle?

    it sounds confusing. I tried solving for P, power but im not sure that what they want. eficciency???? I dont get this

    Thanks in advanced
  2. jcsd
  3. Apr 2, 2005 #2

    Andrew Mason

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    Efficiency is: energy output/energy input.

    Power x time = energy = volts x amps x time

    Last edited: Apr 2, 2005
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