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Homework Help: Current through a circuit with switches

  1. Mar 6, 2010 #1
    1. The problem statement, all variables and given/known data
    http://i.imagehost.org/view/0578/bulbsb [Broken]
    Consider the current flowing through bulb 1. In each situation, does the current through bulb 1 increase, decrease, or stay the same.

    1. All switches are closed, then switch 1 is opened.
    2. All switches are closed, then switch 2 is opened.
    3. Then switch 1 is also opened.
    4. Finally, switch 3 is opened as well.

    2. Relevant equations

    I = V/R

    3. The attempt at a solution

    1. Increase - rather than splitting the current between bulbs 1 and 2/3, all of the current can go through 1.
    2. stay the same? - this would only increase bulb 6?
    3. Increase - similar to 1
    4. increase - all the current must go through bulb 1 and 5 now
    Last edited by a moderator: May 4, 2017
  2. jcsd
  3. Mar 6, 2010 #2
    It seems you exchanged S2 and S3. (or questions 2 and 4). The rest is Ok.
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