What is the difference between the terminal voltage of a battery and its emf
What is difference between emf and voltage?
| Difference Between EMF and Voltage | |
|---|---|
| E = I * (R + r) | V = I * R |
| It follows the coulomb force operation | It follows a non-coulomb force operation |
| It measured with EMF meter | It is measured with a voltmeter |
| It is always greater than the voltage | It is always lesser than EMF |
What is difference between terminal potential difference and 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.
What is emf and terminal voltage?
Terminal voltage is the potential difference across the terminals of a load when the circuit is switched on. E.m.f. is the maximum potential difference that can be delivered by a cell or a generator when no current flows through it. Terminal voltage is measured by voltmeter.
Why is the terminal voltage of a battery lower than its emf?
The so-called terminal voltage of a battery is lower than the emf when it is discharging because of the voltage drop across the internal resistance.
What is terminal potential difference?
“Work done by the cell in flowing a unit positive charge from one terminal to other terminal through external resistance in a circuit is called the terminal potential difference or terminal voltage of the cell.”
Are terminal potential difference and potential difference same?
Terminal potential difference of a cell is defined as the potential difference between the two electrodes of a cell in a closed circuit.
Why is terminal voltage more than emf?
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 terminal voltage exceeds the emf?
The terminal voltage will exceed the emf of the battery when current is driven backward through the battery, in at its positive terminal and out at its negative terminal.
Can terminal voltage of a battery be greater than its emf?
The voltage output of the battery charger must be greater than the emf of the battery to reverse current through it. This will cause the terminal voltage of the battery to be greater than the emf, since V = emf − Ir, and I is now negative.
What is the terminal voltage of the battery?
The terminal voltage
of a battery is voltage measured across the terminals of the battery when there is no load connected to the terminal. An ideal battery is an emf source that maintains a constant terminal voltage, independent of the current between the two terminals.
Why the terminal voltage potential difference is less than the emf of the cell?
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.
Can emf be smaller than terminal voltage?
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.
When the terminal potential difference of a cell is greater than its emf?
V=E-Ir, IF I is negative, then V>E, i.e., the terminal potential difference of the cell is more than its emf. This occurs if other cells in the circuit causes current to flow through the given cell from its positive electrode to negative electrode.
When current is drawn from a cell its terminal potential difference is less than the emf?
Answer: Explanation: When no current is drawn from the source then emf and terminal potential difference are equal. If the current is passing through the circuit then the terminal potential difference is less than that of the emf of the source.