Question

The difference between the electrode potentials of two electrodes when no current is drawn through the cell is called:

• A. cell potential
• B. cell emf
• C. potential difference
• D. cell voltage

Answer 1

Answer: (B)

cell emf

Electromotive force:

• The Electromotive force or e.m.f. is the energy provided by a cell or battery per coulomb of charge passing through it, it is measured in volts (V). It is the potential difference across the terminals of the cell when no current is flowing(open circuited).
• It remains constant.
• EMF is the cause.

Potential difference:

• It is the amount of work to be done to move a unit positive charge from one point to another point. It is also measured in volts(V).
• Potential difference does not remains constant.
• Potential difference is the result.