Can emf be greater than potential difference?
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.
Why is the emf of a cell more than the potential difference when the circuit is closed?
Why is the EMF of a cell always greater than its potential difference? – Quora. Maybe be due to the cell has an internal resistance, Some EMF is lost due to the current flowing through the cell. The rest is the potential difference available to the circuit.
Why terminal potential difference is always less than the emf?
When a cell is in closed circuit, i.e., when current is drawn from it, then the potential difference between its electrodes is called the terminal voltage. It is always less than the e.m.f. because when charge flows in a circuit, some energy is spent in the flow of charge through the electrolyte of the cell.
What is the difference between emf and potential difference?
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. The full form of EMF is Electromotive force.
Why emf of the cell is always positive?
The maximum potential difference which can be measured for a given cell is called the electromotive force, abbreviated emf and represented by the symbol E. By convention, when a cell is written in shorthand notation, its emf is given a positive value if the cell reaction is spontaneous.
Can terminal PD be less than emf?
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.
Can terminal PD be greater than emf of a cell justify your answer?
The emf of a cell is greater than terminal voltage because there is some potential drop across the cell due to its small internal resistance.
What is the difference between cell potential and EMF of the cell?
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 …
Is every EMF a potential difference is every potential difference an EMF?
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.
Is emf the same as cell potential?
Can emf of cell always greater than terminal PD?
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 terminal potential difference ever be greater than emf of cell If yes then in what condition?
So, the answer is when the battery is charging the potential difference can be greater than emf.
Why is the emf of a cell always greater than its terminal voltage?
And once it is connected to a circuit, the voltage reduces slightly because of the internal resistance of the voltage source. The terminal voltage of the voltage source is the potential difference across the terminals when it is connected to a circuit. That is why the emf of a cell is always greater than its terminal voltage.
What is the difference between EMF and potential difference in batteries?
EMF is equal to potential difference between plates when the battery is not connected to any external circuit. Potential difference is due to the charge accumulation on the plates. So EMF produces a potential difference between the two terminals which drives the current.
What is the potential difference between two terminals of a cell?
The potential difference between the two terminals of a cell when the cell is NOT supplying any current is called EMF. The EMF is independent of the value of the internal resistance. If a cell of emf E and internal resistance r is directly connected across a Voltmeter, you can measure its EMF.
Why does an electromagnet lose EMF when it is turned on?
Maybe be due to the cell has an internal resistance, Some EMF is lost due to the current flowing through the cell. The rest is the potential difference available to the circuit. The Rock reveals the best success hack everybody needs to try. The big companies don’t want you to know his secrets.