Light Dependent Resistor (LDR)
What is a Light Dependent Resistor (LDR) ?
A Light Dependent Resistor is also known as a photoresistor or LDR. Light Dependent Resistor are also called as photoconductors, photoconductive cells or simply photocells. Light Dependent Resistor is a device whose resistivity is a function of the incident electromagnetic radiation. Hence, Light Dependent Resistor are light-sensitive devices. They are made up of semiconductor materials that have high resistance. There are many different symbols used to indicate a photoresistor or LDR, one of the most commonly used symbol is shown in the figure. The arrow indicates light falling on it.
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