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Under what circumstances can the terminal potential difference of a battery exceed its emf?
"The potential difference between the terminals of a battery will equal the emf of the battery when there is no current in the battery. At this time, the current though, and hence the potential drop across the internal resistance is zero. This only happens when there is no load placed on the battery-that includes measuring the potential difference with a voltmeter! 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."
Raheel Ahmed
Quaid i Azam University Islamabd
Physics Dept
What else can I help you with?
What is terminal PD?
A terminal potential difference is the potential difference appearing across the terminals of a voltage source, such as a battery or a generator, which varies according to the load supplied.When the battery or generator is off load (i.e. no load is connected to it), the terminal potential difference is equal to the electromotive force of that battery or generator.The terminal potential difference tends to decrease as the load current increases, due to a corresponding increase in the internal voltage drop of the battery or generator.
A battery has a difference in potential energy between the positive terminal and negative terminal which units express this difference in energy?
That's a difference in electrical potential, not potential energy.It's described in units of "volts".
When is the terminal potential difference of a battery greater than its emf?
When it is being loaded.
A battery has a difference in potential energy between the positive terminal and negative terminal which units express the difference?
Volts. Volts is another term for potential.
What is the driving force for the flow of electrons in battery's?
potential difference between electrodes
What causes current to flow in a battery?
Current flows in a battery due to the movement of charged particles, typically electrons, from the battery's negative terminal to its positive terminal through an external circuit. This movement is driven by the potential difference, or voltage, between the terminals of the battery.
What device creates a potential difference in an electric circuit?
A battery is the device that creates a potential difference in an electric circuit. It establishes an electric field within the circuit that allows charges to move from the positive terminal to the negative terminal, creating an electrical current.
What is the driving force for the flow of electrons batteries?
potential difference between electrodes
What enables the charges in an electrical ciruit to flow?
The charges in an electrical circuit flow due to the presence of a potential difference, created by a voltage source like a battery or generator. This potential difference provides the force necessary for the charges to move through the circuit, from the higher potential (positive terminal) to the lower potential (negative terminal).
What is the difference between a positive terminal and negative terminal of a battery?
The positive + terminal is slightly larger.
The potential difference of a battery depends on having an excess number of electrons at the negative terminal and a deficient number of electrons at the positive terminal?
That is true but not very - the excess of electrons at the negative terminal is small. The important thing is that if you place a load (radio set, light bulb etc.) on the battery the electrons flow through the load and this movement is supported by energy supplied by chemical action in the battery.
Can terminal potential difference be greater than the emf supplied?
No, the terminal potential difference cannot be greater than the emf supplied. The emf represents the maximum potential difference that the cell or battery can provide, while the terminal potential difference is the actual potential difference across the terminals when a load is connected.
