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Homework Help: What potential difference means?

  1. Oct 30, 2011 #1
    Can someone explain to me what potential difference means?
    Lets say point A has a potential of 100 V and point B has a potential of 0 V.
    So V_AB would be 100 - 0 = ΔV

    But what exactly does that tell us? What does ΔV=100 do ?
  2. jcsd
  3. Oct 30, 2011 #2
    Potential is the difference between electrical potential energy per unit charge between two points. In other words, it is the work required to move a charge from point A to point B, per unit charge. For example, if 1 joule of energy is used to move a negative charge of 1 coulomb from point A to point B, there exists a voltage difference of 1 V between the points.
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