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A 9 volt battery is hooked up to two resistors in series

  1. Jun 24, 2012 #1
    1. A 9 volt battery is hooked up to two resistors in series. One has a resistance of 5 ohms, and the other has a resistance of 10 ohms. Several locations along the circuit are marked with letters, as shown above. If the voltage is zero at the negative terminal of the battery, the voltage at location B is diagrama pregunta 9.JPG



    2. Relevant equations
    I1=I2=Itotal
    I=V/R
    V=I*R
    3. The attempt at a solution
    I=9volts/(5+10)ohms
    I=0.6A

    Now we have the current in the entire circuit
    with that:

    Vb=0.6A*5
    V=3volts


    so here is my question,
    at B there is 9 voltsw(wich is the total of voltage)- 3 Volts(wich is the ampunt of wolts that we took with the resistence) = 6vots?

    is this the right approach or is 3 volts at location b?

    Thanks!
     
  2. jcsd
  3. Jun 24, 2012 #2

    TSny

    User Avatar
    Homework Helper
    Gold Member

    Yes :smile: . V = IR gives you the voltage drop as you go from one side of a resistor to the other side if you go in the direction of the current. The left side of the 5-ohm resistor is connected to the + side of the battery, so a point at the left side of the resistor is at the same potential as the + side of the battery (9V). As you go through the resistor to get to B, the voltage drops by 3 volts, giving you a potential of 6 V at B.
     
  4. Jun 24, 2012 #3
    Thank you so much!!!! :D
     
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