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    Application

                        Lighting  Control:  Used  in  home  lighting
                        systems to adjust brightness according to user
                        preference or time of day.

                     Using Light Sensor (LDR) to Control Circuits

                     A light sensor is a device that detects the
                     amount  of  light  in  its  surroundings.  It

                     helps  devices  understand  how  bright  or
                     dark it is and react accordingly.

                     Working

                     1. Detecting Light: The light sensor senses the brightness of the light around
                        it. It measures how much light is hitting the sensor and sends a signal based
                        on the amount of light.

                     2.  Converting  Light  to  Electrical  Signal:  The  light  sensor  changes  the

                        brightness it detects into an electrical signal. This signal can be used to
                        control other parts of a circuit.

                     3.  Response to Light: When there is a lot of light, the sensor can trigger a
                        reaction, like turning off a nightlight during the day. If it’s dark, it might

                        turn the light on.

                     Application

                     Street Lights: Some street lights have light
                     sensors. When it gets dark outside, the sensor

                     detects the low light and automatically turns
                     on the street lights. When the sun comes up,
                     the sensor detects brightness and turns the

                     lights off.

                                                                            Introduction to Electronics and Circuits  47

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