LDRs and thermistors
Lesson 6 / 6
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I can describe how an LDR or a thermistor can be used in a sensing circuit.
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An LDR is made of a semiconductor, and the brighter the light shining on it, the lower its resistance.
Light transfers energy that enables electrons in a semiconductor to move as they do in a metal conductor.
A thermistor is made of a semiconductor, and the hotter it is, the lower its resistance.
Heating transfers energy that enables electrons in a semiconductor to move as they do in a metal conductor.
A potential divider circuit can be set up with an LDR/thermistor to trigger a switch if it becomes too dark or too cold.
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