Podcast
Questions and Answers
What is the difference between emf and potential difference in a battery?
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. (correct)
- Emf is the potential difference, while potential difference is the emf.
- Emf and potential difference are the same thing in a battery.
- Emf is the work done in moving a charge, while potential difference is the energy required to move a charge against the electric field.
How does the emf of a battery compare to the potential difference?
How does the emf of a battery compare to the potential difference?
- There is no relationship between emf and potential difference.
- Emf is always less than the potential difference.
- Emf and potential difference are always equal.
- Emf is always greater than the potential difference. (correct)
Which of the following fields is the concept of emf applicable to?
Which of the following fields is the concept of emf applicable to?
- Electrical, magnetic, and gravitational fields.
- Magnetic, gravitational, and electrical fields.
- Electrical and magnetic fields.
- Electrical fields only. (correct)
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?
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?
In a parallel circuit, how is the dissipated power related to the resistance?
In a parallel circuit, how is the dissipated power related to the resistance?
What is the energy dissipated in a resistor converted to?
What is the energy dissipated in a resistor converted to?
Which of the following statements about electromotive force (EMF) is correct?
Which of the following statements about electromotive force (EMF) is correct?
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?
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?
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?
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?
Which of the following fields can the EMF of a battery produce?
Which of the following fields can the EMF of a battery produce?
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?
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?
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?
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?
What is the definition of electromotive force (emf) of a source?
What is the definition of electromotive force (emf) of a source?
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?
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?
What is the term used to describe the potential difference between the terminals of a battery when it is in use?
What is the term used to describe the potential difference between the terminals of a battery when it is in use?
Which instrument is used to measure the electromotive force (emf) of a battery?
Which instrument is used to measure the electromotive force (emf) of a battery?
What is the concept of potential difference applicable to, apart from electric fields?
What is the concept of potential difference applicable to, apart from electric fields?
