Question

difference between terminal potential difference and emf. Are these values fixed for a given battery or can they change? explain why

Answer 1

Electromotive force

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.

Emf doesn't change as clear from definition

Potential diff changes