Battery - steady volt? how?

Discussion in 'General Electronics Chat' started by Mani, Aug 14, 2005.

  1. Mani

    Thread Starter New Member

    Aug 14, 2005
    2
    0
    Hi,
    Nernst equation says that ? = ??+(RT/nZ)ln[products]/[reactants] suggesting that the potential difference between the terminals of the battery is dependent on the concentration of reactants and products. Since the concentration of the reactants and products is continuously changing as the reaction proceeds to produce current, how can a battery maintain, in theory, a constant voltage? The battery will probably maintain a constant voltage for an infinitesimal time at the very beginning of the reaction where the concentration of the reactants and products haven't changed their concentration appreciably; but what about the rest of the time?

    Thanks in advance if anyone could throw some insight.
    Mani
     
  2. hgmjr

    Moderator

    Jan 28, 2005
    9,030
    214
    mani,

    Member pebe was kind enough to post this link to a website containing some very useful information on battery technology.

    Battery Info

    hgmjr
     
  3. thingmaker3

    Retired Moderator

    May 16, 2005
    5,072
    6
    The quick route to the long answer is found in Pebe's link, "Part One," under Discharging - Calculating Battery Run Time.

    The short answer is that batteries do not provide constant voltage.
     
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