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Current through Point or Cross Sectional Area

  1. Jan 24, 2015 #1
    1. The problem statement, all variables and given/known data
    I'm finding conflicting statements. One says that current is measured as the amount of charge per time that enters through a cross sectional area. Another says that current is measured as the amount of charge per time that passed through a point. Could someone clarify this for me?

    2. Relevant equations
    I = Q/t

    3. The attempt at a solution
    Physics Classroom and Wikipedia.
     
  2. jcsd
  3. Jan 24, 2015 #2

    mfb

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    2016 Award

    Staff: Mentor

    Charge does not pass through a point.
    In electronic circuits, you often do not care about the details of your cable cross-section, so you can talk about "points" that are really cross-sections across the cable.
     
  4. Jan 24, 2015 #3
    Thanks so much.
     
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