I–V Graphs (AQA GCSE Physics Combined Science): Quizzes
📚Quizzes
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12 questions from this quiz
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Practise the questions
12 questions from this quiz
In an I-V graph, which variable is on the y-axis?
In an I-V graph, which variable is on the y-axis?
Current
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 are the units of resistance in the formula ?
What are the units of resistance in the formula ?
Ohms (Ω)
What property defines an ohmic resistor?
What property defines an ohmic resistor?
Current and voltage are 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 the origin
How does resistance change in a non-ohmic resistor?
How does resistance change in a non-ohmic resistor?
Changes depending on current
Why does resistance increase in non-ohmic resistors when current increases?
Why does resistance increase in non-ohmic resistors when current increases?
Wire heats and atoms vibrate more
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?
A threshold voltage
What happens to diode resistance above the threshold voltage?
What happens to diode resistance above the threshold voltage?
Drops rapidly and current rises
What is the resistance of a diode in the reverse direction?
What is the resistance of a diode in the reverse direction?
Very high for all voltages