I–V Graphs and Resistors (AQA GCSE Physics): Quizzes
📚Quizzes
Practise the questions
12 questions from this quiz
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Practise the questions
12 questions from this quiz
What is plotted on the y-axis of an I–V graph?
What is plotted on the y-axis of an I–V graph?
Current
What is plotted on the x-axis of an I–V graph?
What is plotted on the x-axis of an I–V graph?
Potential difference
What does the gradient of an I–V graph represent?
What does the gradient of an I–V graph represent?
Resistance
Which formula is used to calculate resistance?
Which formula is used to calculate resistance?
What is the unit of resistance?
What is the unit of resistance?
Ohms (Ω)
What defines an ohmic resistor?
What defines an ohmic resistor?
Current and voltage are directly proportional
What shape is the I–V graph for an ohmic resistor?
What shape is the I–V graph for an ohmic resistor?
Straight line through origin
What happens to a non-ohmic resistor when current increases?
What happens to a non-ohmic resistor when current increases?
It gets hot
Why does resistance increase in hot non-ohmic resistors?
Why does resistance increase in hot non-ohmic resistors?
Metal atoms vibrate
In how many directions can a diode allow current to flow?
In how many directions can a diode allow current to flow?
One direction only
What must potential difference reach for a diode to conduct?
What must potential difference reach for a diode to conduct?
Threshold voltage
What happens to resistance in the reverse direction of a diode?
What happens to resistance in the reverse direction of a diode?
Remains very high