The e.m.f of a device is a measure of energy , the device gives to each coulomb of charge. If a battery supplies 5 joules of energy per coulomb,we say that it has an e.m.f. Of 5 volt.
The potential difference between two points say A and B,is a measure of energy used by one coulomb in moving from A to B.Thus if potential difference between between points A and B is 2 volt it means that each coulomb will gave up an energy of 2 joules in moving from A to B.
The e.m.f is not a force that cause current to flow but it is the energy supplied to charge by some active device such as battery.
E.m.f. maintains potential difference while potential difference causes current to flow .
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