How does sound, light or movement work with electrical components, eg alarms and lighting.   

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In 4-6 by Professor (21.6k)  

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by Olympian (1.5k)  

How does sound, light work with electrical components:

5:40 min you can see the light-dependent resistor ( Photoresistor ) and how it is used in electronic components



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by Professor (21.6k)  
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