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ringing. But when you don’t press the switch, the circuit is open, and the

buzzer stays quiet.

Application

This doorbell circuit can also be
used in schools or offices to alert

staff when someone arrives or needs
assistance. When the button is

pressed, it sounds the buzzer, letting
everyone know to pay attention.

RGB Light Circuit

One day, Riya wanted to create a colourful light for her room. She found
a special light called an RGB LED that could shine in many colors. By
connecting it to a battery and a switch, she could change the colors just

by pressing a button. Now, her room was bright and cheerful, filled with
beautiful lights that changed every time she played.

Components of RGB Light Circuit

The components of RGB Light circuit are:

• RGB LED: An RGB LED is a special kind

of tiny light that can change colors! It
has three colors inside: red, green, and

blue. When you mix these colors together, you can make many different
colors shine, like purple, yellow, or white. It’s like having a magical

light bulb that can glow in different colors.

• Resistor: A resistor is a part that slows

down electricity so that other parts don’t
get too much power. It helps protect

things like lights from breaking.

• Battery: A battery gives power to things like toys
and lights. It has two ends—one positive (+) and

one negative (−) and they need to be connected
correctly for everything to work.

Understanding the Circuits 23