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    Observation

                     Students will notice that the buzzer makes a sound only when the push
                     switch is pressed. When the switch is not pressed, the buzzer stays silent.

                     They will observe that pressing the switch creates a closed circuit, allowing
                     the electricity from the battery to power the buzzer.

                     Real Time Application

                     This simple circuit is like how doorbells work at home. When you press

                     the button outside someone’s house, the circuit closes, and the doorbell
                     rings, alerting the person inside. When the button is released, the circuit

                     opens, and the sound stops.

                     Water Level Indicator

                     Water can let electricity pass through it, but it depends on what is in

                     the water. If water is pure, it does not allow electricity to move easily.
                     However, most water has some minerals and salts in it, which makes it a

                     good conductor, meaning electricity can pass through.

                     This is why we should be careful around water and electricity because

                     the water can carry the electric current, and it could be dangerous if it
                     touches us.

                     Example: If you put two wires with electricity in salty water, the electricity
                     can move through the water and power something like a small light.

                     Components for the Water Level Indicator

                     The components of Water level Indicator are:

                                                                   •  LED: An LED is a tiny light that glows
                                                                  when  electricity  goes  through  it.  You

                                                                  can find it in many colors like red, blue,
                                                                  and green. It is like a small light bulb.

                        • Switch: A switch is like a button that controls if something is ON or

                        OFF.  When  you  turn  it  ON,  things  like
                        lights or fans can work. When you turn it

                        OFF, they stop working.

                                                                                      Understanding the Circuits  39

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