LDR Quiz: Light Dependent Resistor MCQs and Flashcards

6 Questions

To indicate the presence or absence of light, or to measure the light intensity.

Very high, sometimes up to 1MΩ

Piezoelectricity, where certain crystals change shape when an electric signal is applied to them.

It is a small, efficient, and compact component that can be easily used on a breadboard.

To control the lighting of the street lamp based on the presence or absence of light.

An LDR is a sensor that responds to light, while a piezo buzzer is an output device that produces sound.

Study Notes

A photoresistor or light dependent resistor is an electronic component sensitive to light.
When light falls upon it, the resistance changes.
Used to indicate the presence or absence of light, or to measure the light intensity.
In the dark, the resistance is very high, up to 1MΩ.
When exposed to light, the resistance drops dramatically, even down to a few ohms.
Applications: solar street lamps, night-lights, clock radios, photographic light meters, fire or smoke alarms, and lighting controls for street lamps.

A small yet efficient component to add sound features to a project/system.
A very small and compact 2-pin structure that can be easily used on a breadboard.
A "piezo buzzer" is a tiny speaker that can be connected directly to an Arduino.
"Piezoelectricity" is an effect where certain crystals change shape when electricity is applied to them.
By applying an electric signal at the right frequency, the crystal can make sound.
Applications: alarms, automobile alerts, warning devices, electronic fields, and pest deterrent machines.