Current-voltage characteristics (AQA A-Level Physics): Quizzes
📚Quizzes
Practise the questions
10 questions from this quiz
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Practise the questions
10 questions from this quiz
For an ohmic conductor, how does current relate to potential difference at constant temperature?
For an ohmic conductor, how does current relate to potential difference at constant temperature?
Directly proportional
What is the key property of resistance in an ohmic conductor?
What is the key property of resistance in an ohmic conductor?
It is constant
What shape is the graph for an ohmic conductor?
What shape is the graph for an ohmic conductor?
Straight line through origin
What is the threshold voltage in a semiconductor diode?
What is the threshold voltage in a semiconductor diode?
Min. voltage for current to flow
What is the resistance characteristic of a diode in reverse bias?
What is the resistance characteristic of a diode in reverse bias?
Very high resistance
How is the graph of a semiconductor diode described?
How is the graph of a semiconductor diode described?
Highly asymmetric
How does a filament lamp's resistance change as current increases?
How does a filament lamp's resistance change as current increases?
Increases due to heating
Why does a filament lamp's graph curve at higher currents?
Why does a filament lamp's graph curve at higher currents?
Resistance increases with heating
What resistance are ammeters assumed to have in circuit measurements?
What resistance are ammeters assumed to have in circuit measurements?
Zero resistance
What resistance are voltmeters assumed to have in circuit measurements?
What resistance are voltmeters assumed to have in circuit measurements?
Infinite resistance