What Is the Difference Between Potential and Potential Energy in Electronics?

Click For Summary
SUMMARY

The discussion clarifies the distinction between potential and potential energy in electronics, emphasizing that potential is measured in volts (V) while potential energy is expressed in electron volts (eV). It is established that potential is the energy per unit charge, where multiplying potential by charge yields potential energy. The conversation highlights that for moving an electron from the valence band to the conduction band, an energy input of 1.1 eV is required, which can be provided by accelerating the electron through a potential difference of 1.1 V. The context dictates whether to use volts or electron volts, with high-energy physicists favoring eV and educational contexts often requiring Joules.

PREREQUISITES
  • Understanding of electric potential and its measurement in volts (V)
  • Knowledge of potential energy and its representation in electron volts (eV)
  • Familiarity with the concept of charge, specifically the electron charge (1.6 x 10-19 Coulomb)
  • Basic grasp of the relationship between energy, mass, and the equation E = mc2
NEXT STEPS
  • Research the relationship between voltage and energy in electronic circuits
  • Explore the concept of band theory in semiconductors, focusing on valence and conduction bands
  • Study the principles of electron acceleration in electric fields
  • Learn about the applications of electron volts in high-energy physics
USEFUL FOR

Electronics students, electrical engineers, physicists, and anyone interested in the principles of energy transfer in electronic systems.

PhysicsTest
Messages
256
Reaction score
27
TL;DR
I want to know the difference between potential and potential energy in electrostatics
I want to know the difference between potential and potential energy. The potential is measured in volts and we provide potential ex 12V to a circuit. Some times we also say a potential energy to be applied to the electron ex. 1eV etc. I know eV is energy, but my question is do we need to provide Volts or electron volts (energy)? How do i differentiate when to apply what?
 
Engineering news on Phys.org
Potential is potential energy per unit charge. In other words, if you multiply potential by charge you get potential energy.
 
Electric potential is in volts ( Joules/Coulomb )
Mechanical potenial energy is in Joules

Mechanical potential energy of a charge is in Joules / Coulomb * Coulomb
Electron charge is e ( 1.6 e-19 Coulomb )
Mechanical potential energy of an electron is in Volts * e, aka eV

So far, no big deal.
It becomes interesting and useful in context, e.g. when mass and energy become equivalent with ## E = mc^2##. And suddenly we don't speak of electron mass in kilograms but the equivalent 511 keV/c2

So
PhysicsTest said:
do we need to provide Volts or electron volts
is easy: Volts for potential, eV for energy, eV/c^2 for mass.
All three different dimensions !

The question 'do we need to provide Joules or eV' is not so easy: depends on the context ! (High energy physicists use eV, high school exercises often explicitly ask for Joules).
 
I understand some of them, but one particular question i want clarity is,
To move an electron from valence band to conduction band you need to give 1.1eV of energy. So, here do we provide energy to the electron of 1.1eV or provide 1.1V volt to the electron using battery? or both of them mean the same?
 
PhysicsTest said:
I understand some of them, but one particular question i want clarity is,
To move an electron from valence band to conduction band you need to give 1.1eV of energy. So, here do we provide energy to the electron of 1.1eV or provide 1.1V volt to the electron using battery? or both of them mean the same?
One way to provide an electron with ##1.1eV## is to accelerate it through ##1.1V##.
 

Similar threads

  • · Replies 21 ·
Replies
21
Views
3K
  • · Replies 11 ·
Replies
11
Views
2K
  • · Replies 8 ·
Replies
8
Views
1K
Replies
3
Views
3K
  • · Replies 3 ·
Replies
3
Views
2K
Replies
8
Views
4K
  • · Replies 1 ·
Replies
1
Views
2K
Replies
8
Views
4K
Replies
12
Views
2K
Replies
9
Views
4K