Question

If an LDR is connected to an LED and a battery and is brought from the dark to the light, what will be the state of the LED?

(a) Lit

(b) Not lit

(c) Damaged by voltage change

(d) Damaged by power surge

The question was asked by my college professor while I was bunking the class.

My query is from LDR Sensor topic in division Interfacing of Sensors, Actuators, and Other Modules of Arduino

Answer 1

Right option is (a) Lit

The explanation is: The resistance of an LDR depends upon the amount of light that is incident on it. So greater the light intensity, lesser is it’s resistance, and so greater is the current flowing through to the LED making it brighter.