Resistors, Lamps and Diodes
These small components allow us to control the current and potential difference in different parts of a circuit. Their key feature is that their resistance remains constant.
This example shows how you can read data off a graph to calculate an answer.
The Filament Lamp
These light bulbs work with a very thin wire. As it heats up it starts to glow and give out light.
Filament Lamp: Example A
This example looks at how you can take data from a graph to calculate the resistance at a certain value of potential difference.
Filament Lamp: Example B
Here you need use your knowledge of physics to explain why the resistance changes.
These small components work like a one way valve, so the current only flows one way.
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