Is EMF equal to potential difference?
Electromotive force (EMF) is equal to the terminal potential difference when no current flows. EMF and terminal potential difference (V) are both measured in volts, however they are not the same thing. EMF (ϵ) is the amount of energy (E) provided by the battery to each coulomb of charge (Q) passing through.
Can EMF be less than potential difference?
4 Answers. Yes it can, for example when a cell is being recharged the terminal pd is V=E+IR where E is the emf of the cell, I is the current passing through the cell from positive to negative terminal and R is the internal resistance of the cell.
Is EMF and cell potential same?
The difference between electrode potentials of two electrodes of electrochemical cell when no current is drawn from the cell is known as ‘Electromotive Force (EMF)’ of a cell, while the difference between the electrode potential of two electrodes when the cell is sending current through the circuit is called ‘Cell …
When the potential difference is said to be an emf of a cell?
Emf is said to be the potential difference across the terminals of a cell when no current flows through it or when it is an open circuit.
What is the difference between EMF and terminal potential difference of a cell?
Terminal voltage is the potential difference across the terminals when the circuit is switched on. Whereas EMF is the maximum potential difference that a cell or a generator is able to produce when there is no current flow across it.
How do you find potential difference with EMF?
Internal resistance of a cell. This shows that we can calculate the EMF if we know the voltage across the terminals, the current flowing and the internal resistance of the cell….The Formula for Calculating the EMF.
| \(\varepsilon\) | electromotive force |
|---|---|
| E | the energy in the circuit |
| Q | Charge of the circuit. |
Can potential difference of a cell be greater than emf?
The potential difference across a battery cannot be greater than its emf. When current flows, the potential difference across the terminals of the battery is decreased as some potential drop due to its internal resistance.
When can a cell have potential difference greater than its emf?
So, the answer is when the battery is charging the potential difference can be greater than emf.
What is the difference between EMF and potential difference in chemistry?
Hint: EMF is the energy per unit charge exerted by an energy source. Potential difference is the energy released when the unit quantity of electricity passes from one point to another.
What is EMF cell?
The electromotive force of a cell or EMF of a cell is the maximum potential difference between two electrodes of a cell. It can also be defined as the net voltage between the oxidation and reduction half-reactions. The EMF of a cell is mainly used to determine whether an electrochemical cell is galvanic or not.
Can a cell have zero terminal potential difference under what condition?
Current Electricity. Write the condition under which the potential difference between the terminals of a battery and its emf are equal. That is, When the internal resistance of battery is zero, the potential difference is equal to emf.
Under what conditions can a cell have zero potential difference?
When cell is short circuited, it gets totally dischargred. The potential difference between the two plates of the cell become zero.