This downloadable resource is a student practical activity where students examine the properties of variable resistors.
In the activity students create a variable resistor using a shaded-in 'box' drawn with a 'lead' pencil (graphite really) and use it in series with a Light Emitting Diode (LED) to control the amount of light emitted by the LED.
The document contains student instructions and questions to answer.
Teacher notes are provided on page 2 of the document.
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