What is the function of a Light Dependent Resistor (LDR)?

A Light Dependent Resistor (LDR) is a type of resistor that changes its resistance based on the amount of light it is exposed to. The primary function of an LDR is to detect light intensity; as light levels increase, the resistance of the LDR decreases, allowing more current to flow through the circuit. This characteristic makes LDRs ideal for use in various applications, such as automatic lighting systems, where they can trigger lights to turn on or off depending on the ambient light level.

In contrast, the other options describe functions that are not applicable to an LDR. For instance, measuring temperature changes is not within the capability of an LDR, as they are specifically designed for light detection. Similarly, amplifying electrical signals is a function typically associated with transistors or operational amplifiers, not resistors. Finally, storing energy is the function of capacitors or batteries, which can hold electric charge for later use, rather than a resistor that simply changes its resistance based on external factors.