difference between EMF and terminal potential
Answers
1. What is electromotive force? The potential difference between the two terminals of a cell is called electromotive force in an open circuit.
2. Electromotive force transmits current both inside and outside the cell.
3. Electromotive force emf is the cause.
4. Electromotive force is always greater than potential difference.
5. Electromotive force creates potential difference entire the circuit.
6. Electromotive force does not depend on the resistance of the circuit.
7. Electromotive force remains constant.
8. The part of the circuit where electrical energy is created from any other energy then that part contains the source of Electromotive force.
Potential difference
1. What is potential difference in a circuit? Bringing a unit positive charge from one point to another point in a circuit is called potential difference between two points.
2. Potential difference current transfers between any two points in the circuit.
3. Potential difference is the result.
4. Potential difference is always less than electromotive force.
5. Potential difference takes place between any two points in the circuit.
6. Potential difference of two points depends on the resistance of those points.
7. It does not remain constant.
8. Potential difference exists in the part of the circuit where electrical potential energy is transformed into another form of energy.
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EMF It is the work done by a source in taking a unit charge once round the complete circuit.
PD It is the work done in taking a unit charge from one point of the circuit to another.
EMF It is related with the source of current.
PD It is related with any 2 points of a closed circuit.
EMF It is a cause of the PD between any 2 points in the circuit i.e., when emf is applied in a circuit, pd is caused. It maintains PD.
PD It is an effect (of emf). It causes current to flow.
EMF It is the maximum PD between the 2 terminals of the source when the source is in an open circuit.
PD May exist between any 2 points of a closed circuit.
EMF Exists even when the circuit is open.
PD Exists only when the circuit is closed.
EMF It is larger than the PD across any circuit element.
PD It is always less than the EMF.
EMF = Sum of the PD across all the components of a circuit including the PD of the cell.
PD In a closed circuit, different circuit elements will have different PD.
EMF Has a non - electrostatic origin.
PD It originates from the electrostatic field set up by the charges accumulated on the 2 terminals of the source.