Light Detecting Resistor

Light detecting resistor (LDR) is a resistor whose resistance decreases with increasing incident light intensity

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LDRs or Light Dependent Resistors are very useful especially in light/dark sensor circuits.  Normally the resistance of an LDR is very high,
sometimes as high as 1000 000 ohms, but when they are illuminated with light resistance drops dramatically.

Light dependent resistors have become very useful to the world.
Without them lights would have to be on all the time, or they would have to be manually adjusted.  A light dependent resistor saves money
and time for any creation that needs a change in light.

Another feature of the light dependent resistor is that
it can be programmed to turn on with changes in movements.
This is an extremely useful feature that many security systems employ.
Security would be harder without light dependent resistors.

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