Comparison of emf and Potential Difference - QS Study
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Comparison of emf and potential difference:

  1. The difference of potentials between the two terminals of a cell in an open circuit is called the electromotive force (emf) of a cell. The difference in potentials between any two points in a closed circuit is called potential difference.
  2. The emf is independent of external resistance of the circuit, whereas potential difference is proportional to the resistance between any two points.