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Voltage reference direction

  1. Jun 8, 2013 #1
    I see a lot of voltage drops being represented as an arrow. Say a voltage of 20V is represented as an arrow from point a to point b.

    What is the polarity of and b then? Do the arrows to represent voltage usually go from + to - or from - to +?

    Thanks for your time.
     
  2. jcsd
  3. Jun 8, 2013 #2
    By convention the arrows represent a positive change in potential so they point to the higher voltage.
     
  4. Jun 8, 2013 #3
    I'm still trying to make sure I really understand this. Can someone answer my example question?

    Say a voltage of 20V is represented as an arrow from point a to point b. What is the polarity of a and b then?
     
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