LEDs, LDRs + Thermistors

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LEDs, LDRs and Thermistors

LDRs - Light Dependent Resistor

(http://www.bbc.co.uk/schools/gcsebitesize/science/images/ph_elect18_.gif)This is the symbol for a LDR

It works in the way that:

When there is a low light intensity there is a high resistance - low current

When there is a high light intensity there is a low resistance - high current

These can be used for automatic lighting - turn on when it gets dark



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