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Voltage drop in Capacitors and Lightbulbs

  1. Mar 10, 2009 #1
    The batteries in this cicuit create a total voltage difference of 6 volts across the circuit.
    Assume A is 6 vols in each circuit,
    Record the voltage of the lettered locations at the time when the circuit is first connected, and later when it is fully charged


    Note: bulbs below are identical
    PHP:
           |------A (Bulb)--B---(Bulb)----C--| |--D--|
           |                                         |
          ---                                        |
           -                                         |
           |                                         |
           ------------------------------------------
    PHP:

           |------A--| |--B---(Bulb)--C---(Bulb)---D--| |--E--|
           |                                                  |
          ---                                                 |
           -                                                  |
           |                                                  |
           ----------------------------------------------------
    Any ideas?

    Thanks
     
  2. jcsd
  3. Mar 11, 2009 #2

    tiny-tim

    User Avatar
    Science Advisor
    Homework Helper

    Welcome to PF!

    Hi kkroo! Welcome to PF! :wink:

    Show us what you've tried, and where you're stuck, and then we'll know how to help! :smile:
     
  4. Mar 11, 2009 #3
    Hello,

    I know that the Kirchhoff’s loop rule says the sum of the potential changes in the circuit must be zero. I also know that when the capacitor is fully charged, there is no potential difference bwtween the bubls because they dont shine. Here is what I think so far, but I have no idea if its correct.

    Charging:
    PHP:
           |------6 (Bulb)--3---(Bulb)----0--| |--0--|
           |                                         |
          ---                                        |
           -                                         |
           |                                         |
           ------------------------------------------  
    Charging:

    PHP:
           |------6--| |--6---(Bulb)--3---(Bulb)---0--| |--0--|
           |                                                  |
          ---                                                 |
           -                                                  |
           |                                                  |
           ----------------------------------------------------  
    Charged:
    PHP:
           |------6 (Bulb)--6---(Bulb)----6--| |--0--|
           |                                         |
          ---                                        |
           -                                         |
           |                                         |
           ------------------------------------------  
    Charging:
    ( aim especially stuck on this one, I know the opposite capacitor plates should have the same charge, but I know there cant be a potential difference between the bulbs.
    PHP:
           |------6--| |--0---(Bulb)--0---(Bulb)---6--| |--0--|
           |                                                  |
          ---                                                 |
           -                                                  |
           |                                                  |
           ----------------------------------------------------  
    Any ideas? Please help as soon as you can, this is due in an hour and a half.

    Thanks
     
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