What is the difference between cell potential and EMF?
The potential difference is the measure of energy between any two points on the circuit. The EMF is the maximum voltage that the battery can deliver whereas the magnitude of the potential difference is always less than the maximum possible value of emf.
What is greater EMF or voltage?
The emf of a cell is greater than its terminal voltage because there is some potential drop across the cell due to its small internal resistance.
Can the potential difference across a battery be greater than it’s EMF?
Solution. The potential difference across a battery cannot be greater than its emf. Due to the internal resistance in the battery, the potential difference across it is less than its emf. However, for an ideal battery, potential difference and emf are equal.
Can the terminal voltage of a battery ever exceed its EMF?
The terminal voltage of a battery can exceed its emf if the battery is being charged – if current is passing through the battery “backwards” from positive pole to negative pole. Then the terminal voltage is the emf of the battery plus the voltage drop across the internal resistance.
What is potential difference across the cell?
Answer: The potential difference across the terminals of a cell is called the terminal voltage.
Why EMF of cell is always greater than its terminal voltage?
The emf of a cell is greater than terminal voltage because the potential difference between the two terminals is not connected to any of the circuit. If it connects to the circuit then the voltage is automatically reduced because of the internal resistance.
What is the reason that terminal voltage is less than EMF?
Because emf is the potential difference across the two terminals of a voltage source when it is not connected to any circuit. And once it is connected to a circuit, the voltage reduces slightly because of the internal resistance of the voltage source.
What happens if Ecell is positive?
If Eo(redox reaction) is positive, the reaction will proceed in the forward direction (spontaneous). (see galvanic cells (voltaic cells)). If Eo(redox reaction) is negative (Eo(redox reaction) < 0), the reaction will not proceed in the forward direction (non-spontaneous).