Electric Potential: Understanding the Difference

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SUMMARY

The discussion clarifies the distinction between electric potential and potential energy, emphasizing that electric potential (V) is the potential energy (U) per unit charge (q). The equation U = qV illustrates that potential energy is contingent upon both the electric potential and the charge involved. For instance, a charge of -0.1 C in a potential of 1000 V results in a potential energy of -100 J. The SI units for potential are volts (V) and for potential energy are joules (J), with the relationship defined as 1 V = 1 J/C.

PREREQUISITES
  • Understanding of electric potential (V)
  • Knowledge of potential energy (U)
  • Familiarity with electric charge (q)
  • Basic grasp of SI units (volts and joules)
NEXT STEPS
  • Study the relationship between electric potential and electric fields
  • Explore the concept of work done by electric forces
  • Learn about the applications of electric potential in circuits
  • Investigate the implications of charge interactions in electric fields
USEFUL FOR

Students in physics, educators teaching electricity and magnetism, and anyone seeking to clarify the concepts of electric potential and potential energy.

jorn0807
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Hello I'm very confused on what the difference is between electric potential and Potential Energy. I though they were the same but I realized they're not after I got a 30% on a physics quiz. I tried googling it but it keeps telling me that potential energy is equal to mgh which is from mechanics not electricity and magnetism. Any simple explanations? thanks
 
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Potential: V
Potential Energy: U
Electric Charge: q

The Potential energy U of a charge q placed in a potential V is given by the equation below

U=qV

As you can see, the potential energy depends on the potential but also depends on the charge placed in the potential.
 
The potential is the potential energy per unit positive charge. So if you have a potential of 1000 V and a charge of -0.1 C then the potential energy is -100 J. Note that in the SI system potential is measured in V and potential energy is measured in J. 1 V = 1 J/C.
 

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