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the concept of sensors and how they can be used to automatically control
devices like LEDs based on environmental conditions.

2. Energy Efficiency: The activity demonstrates how circuits can be designed

to conserve energy, with the LED turning on only when needed (at sunset),
connecting to the science of efficient energy use.

Observations

In the Sunset Indicator Circuit activity, students will observe how the LED

responds to the changing light levels. As the ambient light decreases, the
LDR detects the change, and the circuit powers the LED. They will notice the
automatic nature of the system, reinforcing the concepts of light detection and

energy efficient circuit design.

Application

In mobile phones, an LDR (Light Dependent Resistor)
sensor plays a crucial role in managing screen brightness

and enhancing user experience.

Exploring the Working of Refrigerator Lights

21 st #Technology Literacy
Century
Activity Refrigerator Light Circuit Using Skills
Smart Circuit Kit

Step 1 Take out all the components from the smart circuit kit.

1. LED 2. Push Switch 3. Battery

4. 2 Jumper 5. Magnetic Board 6. USB Cable

7. Battery OTG Socket

LED 2 Jumper Push switch

Battery USB Cable Battery OTG Socket

Understanding Circuits and Electronics 43