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WHAT IS DIFFERNCE BETWEEM EMF AND POTENTIAL DIFFERNCE?

WHAT IS DIFFERNCE BETWEEM EMF AND POTENTIAL DIFFERNCE?

Grade:12

1 Answers

SHAIK AASIF AHAMED
askIITians Faculty 74 Points
7 years ago
Hello student,

Potential Difference:Potentialis a function of the location, and potential difference between point A andpoint Bis calculated by subtracting the potential of A from potential of B. In anelectricfield, it is the amount work to be done to move a unit charge (+1 Coulomb) from B to A. Electric potential difference is measured in V (Volts). In an electrical circuit, current flows from the higher potential to lower potential.

EMF (Electromotive Force):EMF is the electrical potential difference provided by an energy source like battery. Varyingmagnetic fieldsalso can generate an EMF according to the Faraday’s law. Although EMF is also a voltage and measured in Volts (V), it is all about the generation ofa potential difference.Sothe important differencesbetween Voltage and EMF is:

  1. The term ‘potential difference’ is used in all energy fields (electric, magnetic, gravitational), and ‘EMF’ is only used in electric circuits.
  2. EMF is the electrical potential difference generated by a source like battery or generator.
  3. We can measure potential difference between any two points, but EMF exists only between the two ends of a source.
  4. Sum of ‘potential drops’ around a circuit is equal to total EMF according to Kirchhoff’s second law.
Thanks and Regards
Shaik aasif
askIITians faculty

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