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Voltage drop across a resistor in a circuit

  1. Mar 18, 2011 #1
    1. The problem statement, all variables and given/known data

    Three batteries and four resistors are connected in a loop as shown (see attachment).

    What is the voltage drop across the top left resistor?

    2. Relevant equations

    V = IR

    3. The attempt at a solution

    This is part 3 of the 3 questions for this problem. On the other two I found the current of the loop and the voltage across points a and b.

    I think that all I need to do here is multiply IR (R being the value of that resistor) but that just seems too easy. Do I have to subtract it from the total voltage for the circuit or something?
    1. The problem statement, all variables and given/known data



    2. Relevant equations



    3. The attempt at a solution
     

    Attached Files:

  2. jcsd
  3. Mar 18, 2011 #2

    jhae2.718

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    Gold Member

    All you need to do is use loop laws to find the current, and then you can find the voltage drop over the resistor using Ohm's law.
     
  4. Mar 18, 2011 #3
    Ok. I already found the current in the circuit and I assumed that I needed to use Ohm's Law to find the voltage drop, but my question is whether I just multiply the current in the loop by the value for the specific resistor and that's it, or if I have to do something after that step?
     
  5. Mar 18, 2011 #4

    jhae2.718

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    Gold Member

    That's it.
     
  6. Mar 18, 2011 #5
    Awesome. Just seemed too easy so I thought maybe something else was going on. Thank you
     
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