Difference Between Voltage And EMF

EMF is a voltage, so the question is unanswerable as it stands.

Try Wikipedia for a full explanation.

Electromotive force (EMF is what is generated by the device due to any of the interactions.

Eg chamical - (Cells), Photo voltaic, Magnetic (Tranformers or Electrical machines)

The voltage - or potential is what is available at the point where you are measuring.

let us say the voltage at the dry cell outlet is the EMF of the cell minus the loss due to it's internal resistance.

The voltage at the generator - will be different at different points - at outlet again it will have the losses associated.

In ideal cases (say i use superconductors) both will be same.

Think about this analogy – a pump is pumping a fluid with a certain pressure head and water flows at certain flow rate.

The pump is analogous to EMF

Pressure head is analogous to Voltage

The flow of fluid is analogous to Current

Hope it helps.

- MS

Or more succinctly;

EMF is the force, Voltage is the measurement.