12 Questions
What is the definition of electromotive force (e.m.f)?
The amount of chemical energy converted to electrical energy per coulomb of charge
How is electromotive force (e.m.f) represented?
ε
Why does a cell become warm after a period of time?
Due to the discharge of electricity
How is e.m.f measured using a voltmeter?
By connecting the voltmeter in parallel with the cell
What happens to the voltage over time in a power supply due to internal resistance?
Decreases
How can a cell be conceptually viewed in terms of e.m.f and internal resistance?
As a source of e.m.f with internal resistance connected in series
What does the terminal potential difference represent in a cell?
The potential difference across the terminals of the cell
What would happen to the terminal p.d if a cell had no internal resistance?
It would be equal to the e.m.f
What is the definition of 'lost volts' in a cell due to internal resistance?
The difference between the e.m.f and terminal p.d
Which equation represents 'lost volts' in a cell according to Ohm's law?
$v = Ir$
Why is the terminal p.d always lower than the e.m.f in a cell?
Due to the internal resistance of the cell
What does 'lost volts' represent in a cell circuit?
Voltage lost in the internal resistance
Test your knowledge on electromotive force (e.m.f) in the context of AS & A Level Physics. Understand the concept of e.m.f as the amount of chemical energy converted to electrical energy per coulomb of charge passing through a power supply, typically represented by the symbol ε (epsilon) and measured in volts.
Make Your Own Quizzes and Flashcards
Convert your notes into interactive study material.
Get started for free
