Question

what is the difference between potential difference and EMF?

Answer 1

The electric charge that has been separated creates an electric potential difference that can be measured with a voltmeter between the terminals of the device. The magnitude of theemf for the battery (or other source) is the value of this 'open circuit' voltage.

Answer 2

Hey !!

DIFFERENCE BETWEEN EMF AND POTENTIAL DIFFERENCE

EMF

• EMF is the potential difference between the two electrodes of the cell when no current is flowing in the circuit (in an open circuit)
• EMF can be measured by potentiometric method only so that the EMF sent by the potentiometer source is equal and opposite to that of the cell and there is no net current flowing in the circuit. It cannot be measured by a voltmeter which draws current.
• EMF is the maximum voltage obtainable from the cell.
• EMF is responsible for the flow of steady current in the circuit.

POTENTIAL DIFFERENCE

• Potential difference is the difference between the electrode potentials of the two electrodes under any condition.
• Potential difference can be measured by a simple voltmeter.
• Potential difference is less than the maximum voltage obtainable from the cell (EMF of the cell)
• Potential difference is not responsible for the flow of steady current in the circuit.

GOOD LUCK !!