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Homework Help: Help with series circuits

  1. May 8, 2010 #1
    1. The problem statement, all variables and given/known data
    First problem is a series circuit with 3 resistors. R1,R2,R3 is 3.0 ohms. This is all powered by a 3.0 V battery.

    What is the current threw resistor 2?


    2. Relevant equations
    V=IR


    3. The attempt at a solution

    3.0=I(3.0)

    Divide both sides by 3.0 and I got 1
    .. the correct answer is 0.33 OHMs
     
  2. jcsd
  3. May 8, 2010 #2
    First of all, the units of current are Amps. I also believe that you misread the question. The total resistance is not 3ohms, instead EACH resistor has a resistance of 3 ohms. So you need to find the equivalent series resistance first, and then apply ohm's law and get the correct answer of 0.33A.
     
  4. May 8, 2010 #3
    erm. . . check your solutions, current is not measured in Ohms.

    First, find equivalent resistance, and remember that current thru a series of resistors is the same.
     
  5. May 8, 2010 #4
    Ok I got the right answer. I got the total resistance and divide it by the volts and i got the current. Thanks guys! What if I have another question on this same sort of problem do i make another thread? Or should i just ask here?
     
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