LDR Working|Light Dependent Resistor in tamil

What is Light Dependent Resistor?
An electronic component like LDR or light-dependent resistor is responsive to light. Once light rays drop on it, then immediately the resistance will be changed. The resistance values of an LDR may change over several orders of magnitude. The resistance value will be dropped when the light level increases.
The resistance values of LDR in darkness are several megaohms whereas in bright light it will be dropped to hundred ohms. So due to this change in resistance, these resistors are extremely used in different applications. The LDR sensitivity also changes through the incident light’s wavelength.
The designing of LDRs can be done by using semiconductor materials to allow their light-sensitive properties. The famous material used in this resistor is CdS (cadmium sulfide), even though the utilization of this material is currently restricted in European countries due to some environmental issues while using this material. Likewise, CdSe (cadmium selenide) is also restricted and additional materials that can be employed mainly include PbS (lead sulfide), InS ( indium antimonide).
Even though for these resistors, a semiconductor material is used, because they are simply passive devices and they do not have a PN-junction. This detaches them from other LDRs such as phototransistors & photodiodes.
LDR Symbol
In electronic circuits, the LDR symbol is used that mainly depends on the resistor symbol; however, it illustrates the light rays in the arrows form. In this way, it follows the same principle which is used for phototransistor & photodiode circuit symbols wherever arrows are utilized to demonstrate the light dropping on these types of components
Applications of LDR
Light-dependent resistors are simple and low-cost devices. These devices are used where there is a need to sense the presence and absence of light is necessary. These resistors are used as light sensors and the applications of LDR mainly include alarm clocks, street lights, light intensity meters, burglar alarm circuits. For a better understanding of this concept, here we have explained one project namely; power conserving of intensity controlled street lights using LDR.
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Easy to understand.
Good luck sir.

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An amazing explanation.. ❤

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Dear, Mr.Arumainathan.
I am an electronics hobbyist in Sri Lanka who learned a lot and cleared many doubts from your lessons. when I am not a formally educated person in electrical and electronics, it was very easy for me to understand even circuit theory and power electronics because of your teaching method and explanation. First of all, I must thank you for your effective service.
Will you please let me know the number of video lessons updated under the headings of BASIC OF ELECTRICAL, ELECTRONICS IN TAMIL, CIRCUIT THEORY, and POWER ELECTRONICS.

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