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Simple circuit problem - Intensity and Difference of electric potential

  1. Sep 23, 2012 #1
    1. The problem statement, all variables and given/known data

    w03wh4.png

    a) Is the current between the points A-B and C-D equal? Why?
    b) Is the difference of potential between the points B-C and A-D equal? Why?

    Also, a question of my own..
    If I = V/R, then when we measure the intensity between A and B shouldn't it be infinite, or at least very great since we're dealing with good conductors, since there's little or no resistance there? Or does Ohm's law refers to the total resistance of the circuit?

    2. Relevant equations

    Ohm's law:

    I = V/R

    I -Intensity
    V - Voltage
    R - Resistance

    3. The attempt at a solution

    a) If I remember correctly the intensity of current is always constant, as long as we're dealing with a serial circuit. I don't know how to explain how tho...

    b) Given Ohm's law, if I is a constant through out the circuit and R will vary depending on where you measure the voltage, then the voltage won't be constant. It will be greater at point B-C, since is is proportional to the resistance.

    Thanks in advance.
    Daniel.
     
  2. jcsd
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