Differences b/w Voltage,EMF,Potential diff.

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SUMMARY

Voltage, electromotive force (emf), and potential difference are distinct yet related concepts in electrical engineering. Voltage is the work done by an electric field when a unit positive charge moves between two points, defined mathematically as UAB = UA - UB. The potential at a point is the work done to move a charge to a reference point of zero potential. Emf refers specifically to the voltage across the terminals of an unloaded voltage source, representing the maximum potential difference available.

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  • Understanding of electric fields and circuits
  • Familiarity with basic electrical terminology
  • Knowledge of unit positive charge concepts
  • Comprehension of voltage source behavior
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  • Explore the concept of potential energy in electric circuits
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Students, electrical engineers, and educators seeking a clear understanding of fundamental electrical concepts, particularly in the context of voltage, emf, and potential difference.

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What are the differences among voltage,emf and potential difference?
n :bugeye: b
 
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rhia said:
What are the differences among voltage,emf and potential difference?
n :bugeye: b

Voltage is defined between two points A, B in an electric field or in an electric circuit as the work done by the electric field when a unit positive charge moves from A to B.
The potential at a point A is defined as the work done by the field when a unite positive charge moves from A to the place of zero potential.
From these definitions follows that the voltage UAB = UA - UB, that is the negative of the potential difference which is UB-UA.
Electromotive force (emf) is defined for voltage sources, and it is equal to the voltage across the terminals of the unloaded source (when nothing is connected to it).

ehild
 

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