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Simple Circuit Analysis

  1. Sep 20, 2009 #1
    1. The problem statement, all variables and given/known data
    I have a box which has two resistors in it, R1 and R2. The box has three terminals: a red, black, and white terminal.

    A voltage source of 10 V is connected across the red and black terminals.

    If I connect a voltmeter across the red and white terminals, what is the expected voltage reading given that R1 = 1 ohm and R2 = 1 ohm?

    2. Relevant equations
    V = IR



    3. The attempt at a solution
    I thought R1 and R2 are in series, so their equivalent resistance is 2 ohms. Then I used V=IR to find the current through the box... 10 V/ 2 ohms = 5 A. Then I multiplied 5 A by 1 ohm (the value of R1) to find the voltage drop to be 5 V across R1. I'm not sure if that's right because are R1 and R2 really in series? And is the measured voltage going to be the combined drop through R1 and R2, or just through R1?

    Help!!
     
    Last edited: Sep 20, 2009
  2. jcsd
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