Table of Contents
Why is terminal voltage lower than emf?
The voltage reduces slightly because of the internal resistance of the cell. The terminal voltage of the cell is the potential difference across the terminals of the cell when it is connected to a circuit. This is why the terminal voltage is always less than the EMF of the same voltage source or cell.
Can terminal voltage be less than emf?
The voltage across the terminals of a battery, for example, is less than the emf when the battery supplies current, and it declines further as the battery is depleted or loaded down.
Why emf is greater than terminal potential difference?
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.
Is it possible that the terminal voltage will be greater than the emf of the battery?
True, yes terminal voltage of a battery can never be greater than the emf of the battery. Because due to internal resistance of the current terminal…
Does terminal voltage equal 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 terminal voltage higher than source voltage?
The explanation: A practical voltage source can be represented with a resistance in series with the source. Hence, there would be some voltage drop at the resistor and the terminal voltage is always lower than the source emf.
What is difference between emf and terminal voltage?
Emf is an open circuit voltage. It is the potential difference between the two terminals of a battery or cell in a closed circuit. Terminal voltage is a closed-circuit voltage. Emf is independent of the resistance of the electrical circuit but is dependent upon the internal resistance of the circuit.
Why terminal voltage is more than emf while charging?
This is because as battery gets more charged and terminal voltage rises, the charging current decreases. As the charging current decreases, any voltage drop due to internal resistance and any external series resistances also decreases.
What is the 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 whereas, E.m.f is measured by potentiometer.
What happen to the terminal voltage of cell if load increases?
Without a load it runs at full speed (open circuit voltage) and as you load it up the terminal voltage lowers as the current taken increases. Eventually, with a shorted out battery the current taken is at maximum but the terminal voltage is zero. The internal resistance of the cell causes this to happen.
What is the difference between terminal voltage and emf?
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 always lesser than the emf of the cell.