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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

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