Resistors, Lamps and Diodes

The Resistor

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.

Resistor: Example

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.

The Diode

These small components work like a one way valve, so the current only flows one way.

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