Meeta's father was driving her to school. At the traffic signal, she noticed that each traffic light was made of many tiny lights instead of a single bulb. When Meeta asked this question to her father, he explained the reason for this.
Answer the following questions based on above information:
(i) What were the values displayed by Meeta and her father?
(ii) What answer did Meeta's father give?
(iii) What are the tiny lights in traffic signals called and how do these operate?
(i) Following values were displayed by Meeta and her father:
Her father: Patience and knowledge
(ii) Meeta’s father probably explained her the benefits of using LEDs instead of a large incandescent bulb in the traffic lights. The benefits of LEDs over large single bulb are listed below:
(iii) These tiny lights are called LEDs (Light Emitting Diodes) and they work on the principle of de-excitation of electrons in a forward-biased semiconductor upon the passing of electricity through them.