1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

From where the E inside the battery comes from?

  1. Apr 9, 2014 #1
    So as I am junior high school student just learned that when the terminals of wire are connected to a battery,an E (electric field) is established inside the battery from positive to negative end/terminal (How did I assumed one as positive and one as negative? COnvention regarding electric fields,am i right?),Work is required to push say,positive charges from negative terminal to positive terminal i.e against the electric field (WHY? obviously to build potential/potential difference b/w both ends) so the work is done by the energy provided by the battery,When positive end would be have charges and negative end do not have them...obviously the current would start to flow from positive to negative terminal...all of this is actually conventional current..

    My question is,from where the Electric field inside the battery comes from?
  2. jcsd
  3. Apr 9, 2014 #2


    User Avatar

    Staff: Mentor

    The EMF is present inside the battery before any external circuit is connected. Have a read through this introductory article at wikipedia:

    http://en.wikipedia.org/wiki/Battery_(electricity [Broken])

    Last edited by a moderator: May 6, 2017
  4. Apr 9, 2014 #3
    thank you i would surely read it aswell :)
    Last edited by a moderator: May 6, 2017
  5. Apr 10, 2014 #4
    The redox chemical reaction moves the ions to their respective terminals creating an electric field and potential difference. Once charges accumulate at the terminals, the redox process is propelling ions to move against the electric field. This increases the voltage at the terminals (potential difference) as well as increase the E field energy. Did I help?

Share this great discussion with others via Reddit, Google+, Twitter, or Facebook