Edexcel IGCSE Physics · Spec 2.7
Current-Voltage (I-V) Characteristics
Current-voltage graphs for a resistor, a filament lamp and a diode.
Physics revision video
Current-Voltage (I-V) Characteristics
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Spec 2.7
What you need to know
- Describe how to obtain an I-V graph
- Recognise the graphs for a resistor, a lamp and a diode
- Explain the shapes
Active recall
Quick check
Answer each question before opening the answer.
What does the I-V graph of a fixed resistor look like?
A straight line through the origin — current is proportional to voltage.
Why does a filament lamp's I-V graph curve (S-shape)?
As current increases the filament heats up, so its resistance increases.
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