Total net voltage applied to lamps

Discussion in 'Homework Help' started by Azure326, Feb 5, 2007.

  1. Azure326

    Thread Starter New Member

    Feb 5, 2007
    Hey guys, I'm doing a HW problem where I'm told to find the total net voltage being applied to 3 identical lamps. Here's my crude drawing:


    Okay, I know that +6V is coming in from above to the lamps and -6V is coming in from the bottom to the lamps. So, how do I find out what the "total net voltage applied to the lamps" is? I would guess 6 V, but I'm not sure due to the wording of the problem. I know that it is 6V -> lamp -> 2V -> lamp -> -2V -> lamp -> -6V.

    MUCH thanks in advance!
  2. mrmeval

    Distinguished Member

    Jun 30, 2006
    You have a 12v supply running 3 equal loads. :)

    That center tap inbetween the batteries is confusing. It's not the lowest potential point and it's just hanging there.
  3. MadTaco

    New Member

    Feb 10, 2007
    Ground can be anywhere... and from what I understand (correct me if I'm wrong), if you're using negative potential you are simply referencing ground from a negative position as opposed to 0V.

    -6V to +6V = 12V

    In this case it just looks like two 6V sources in series, which also gives 12V... which will apply 4V to each lamp.