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This change happens due to light energy provides the materials with extra energy, making it
easier for the electric current to pass through.

Transistor

A transistor is like a tiny switch that can be turned ON or OFF by a small
electrical signal.
When a small current flows into the transistor’s base, it allows a larger
current to flow between its other two terminals.

This allows the transistor to amplify or control electrical signals.

21 st #Information Literacy
Century
Activity Automatic Street Light Skills #Creativity

Overview

In this activity, students will create an automatic street light using a breadboard, a 9V battery, and
various electronic components. By includes an LDR sensor, students will design a circuit that turns
on an LED automatically when it gets dark.

Learning Objective

Understand the basic principles of how an LDR (Light Dependent Resistor) works.

Learn to construct a simple circuit using a breadboard and various electronic components.
Demonstrate the use of a transistor as a switch in an automatic lighting system.

Materials Required

Breadboard Voltage Regulator (7805) LED x 1 Transistor x 1 330 Ω Resistor x 1

100k Ω Resistor x 1 LDR sensor 9v Battery Male to male Connecting Wires Battery Cap

Hands-On Electronics with Breadboard-Based Kit 23