I–V Graphs and Resistors (OCR GCSE Physics A (Gateway Science Suite)): 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, what is plotted on the y-axis?
In an I-V graph, what is plotted 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 is the unit of resistance?
What is the unit of resistance?
Ohms (Ω)
What does the I-V graph of an ohmic resistor look like?
What does the I-V graph of an ohmic resistor look like?
A straight line through the origin
When are current and potential difference directly proportional?
When are current and potential difference directly proportional?
In an ohmic resistor
What happens to the wire in a non-ohmic resistor when current increases?
What happens to the wire in a non-ohmic resistor when current increases?
It gets hot
Why does resistance increase when a non-ohmic resistor gets hot?
Why does resistance increase when a non-ohmic resistor gets hot?
Metal 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 be reached for current to flow through a diode?
What must be reached for current to flow through a diode?
A threshold voltage
What happens to a diode's resistance above the threshold voltage?
What happens to a diode's resistance above the threshold voltage?
It drops rapidly
What is the resistance in the reverse direction through a diode?
What is the resistance in the reverse direction through a diode?
Very high for all voltages