17 Questions
What is the difference between emf and potential difference in a battery?
Emf is the energy required to move a charge, while potential difference is the work done in moving a charge against the electric field.
How does the emf of a battery compare to the potential difference?
Emf is always greater than the potential difference.
Which of the following fields is the concept of emf applicable to?
Electrical fields only.
If 5000 J of work is done to carry a charge between two points with a potential difference of 100 V, what is the amount of charge moved?
5 C
In a parallel circuit, how is the dissipated power related to the resistance?
Power is inversely proportional to the resistance.
What is the energy dissipated in a resistor converted to?
Heat
Which of the following statements about electromotive force (EMF) is correct?
EMF is always greater than the potential difference across a battery.
If 1760 J of work is done to carry a charge between two points with a potential difference of 220 V, what is the amount of charge transferred?
8 C
If the EMF of a cell drops from 3 V to 2.8 V when connected to a 4 Ω load, what is the internal resistance of the cell?
0.5 Ω
Which of the following fields can the EMF of a battery produce?
Electric field only
If the potential difference across a resistor in a circuit is 5 V, and the total voltage supplied by the battery is 12 V, what is the potential difference across the internal resistance of the battery?
7 V
Which of the following expressions correctly represents the relationship between the EMF ($E$), potential difference across a resistor ($V$), current ($I$), and internal resistance ($r$) of a battery?
$V = E - Ir$
What is the definition of electromotive force (emf) of a source?
The energy supplied to unit charge by the cell
If the emf of a battery is $ ext{E}$, the internal resistance is $r$, the external resistance is $R$, and the current is $I$, which of the following equations represents the relationship between these quantities?
$ ext{E} = Ir + IR$
What is the term used to describe the potential difference between the terminals of a battery when it is in use?
Terminal voltage
Which instrument is used to measure the electromotive force (emf) of a battery?
Voltmeter
What is the concept of potential difference applicable to, apart from electric fields?
Both gravitational and magnetic fields
Test your knowledge on electromotive force (emf) and potential difference in circuits. Learn about the relationship between emf and potential difference, as well as their applications in different fields.
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