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Help find work done associated with electric potential

  1. Dec 4, 2007 #1
    given that the electric potential is .70 V higher outside the cell than inside the cell, and that the cell memberane is .1X10^-6 thick. calculate that work that must be done (in joules) to move one sodium ion from inside the cell to outside

    i know V= .70V distance is .1X10^-6
    i made the inside the cell potential energy is 0

    ????
     
  2. jcsd
  3. Dec 4, 2007 #2

    Doc Al

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    Staff: Mentor

    What's the definition of potential difference?
     
  4. Dec 4, 2007 #3
    W = Fd = qEd

    E=Volts/distance

    how do i find the charge (q)
     
  5. Dec 4, 2007 #4
    amount of energy that would be required to move an object from one place to another against various types of forces.

    ok
     
  6. Dec 4, 2007 #5

    Doc Al

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    Combine these two equations.

    What's the charge on a sodium ion? (What's an ion?)
     
  7. Dec 4, 2007 #6
    is it one electron since sodium is in the first column in the periodic table
     
  8. Dec 4, 2007 #7

    Doc Al

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    The charge on the sodium ion is +e, since it is missing an electron. (That's what makes it an ion.)
     
  9. Dec 4, 2007 #8
    W = Fd = qEd
    q= charge on electron
    d= distance
    E= Volts/distance
    am i right?
     
  10. Dec 4, 2007 #9

    Doc Al

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    Combine this:
    With this:
    To get a simpler equation.
     
  11. Dec 4, 2007 #10
    so this W=qEd is the correct equation to find work done in joules. or are there any other equations
     
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