Electric Potential: Va or Vb - Is It Right?

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SUMMARY

The discussion centers on the correct expression for electric potential difference, specifically Vab = Vb - Va versus Vab = Va - Vb. Both expressions are valid depending on the chosen convention, but they yield opposite signs. The relationship Vab = -Vba is established, confirming that the potential difference is dependent on the order of the points chosen. Understanding this concept is crucial for accurately analyzing electric circuits and potentials.

PREREQUISITES
  • Basic understanding of electric potential and voltage
  • Familiarity with circuit analysis terminology
  • Knowledge of conventions in physics regarding potential differences
  • Ability to interpret mathematical expressions in physics
NEXT STEPS
  • Research the implications of voltage sign conventions in circuit analysis
  • Study the relationship between electric potential and electric field
  • Learn about potential differences in complex circuits using Kirchhoff's laws
  • Explore practical applications of electric potential in real-world scenarios
USEFUL FOR

Students of physics, electrical engineering majors, and anyone studying electric circuits will benefit from this discussion on electric potential differences and their conventions.

superaznnerd
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my teacher gave me a handout that said Vab = Vb- Va

However my textbook says Vab = Va-Vb..


Which one is correct? By the way Va means voltage at a and Vb equals voltage at b
 
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They are the same thing. a and b are arbitrary letters to denote which two points you are looking at.
 
Both are correct, as long as you choose one definition and stick with it. Which one to use is just a matter of convention.

EDIT: But they are not the same thing: Vab = -Vba.
 

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