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    B. Fill in the blanks.

                         1.   A circuit is like a path that electricity follows to make things                           .

                         2.  The two ends of a battery are called the positive (+) and                                (-)
                              ends.

                         3.                      are  materials  that allow  electricity  to  flow  through  them
                              easily.

                         4.   A                    is a device that detects light and sends signals based on its
                              brightness.

                         5.  When the circuit is                        electricity cannot flow.

                     C. State whether the following statements are true (T) or false (F).

                         1.  A closed circuit allows electricity to flow.

                         2.  An LED is a type of resistor.

                         3.  Insulators help electricity to flow easily.

                         4.   Potentiometers are used to control the volume or brightness.

                         5.  The power source is not necessary for a circuit to work.

                                                                                                 21 st
                            Try It Yourself Activity                                           Century   #Technology Literacy
                                                                                                Skills
                        Activity: Build a Simple Circuit

                                                                                                    21 st
                          Scenario-Based Questions                                                Century   #Critical Thinking
                                                                                                    Skills
                       1.  Scenario 1

                            Imagine you are at home and the lights go out. You remember how to create a
                           simple circuit. Explain how you could use a battery, LED, and a switch to make
                           a flashlight.

                       2.  Scenario 2

                           You see a streetlight that turns on when it gets dark outside. Describe how a
                           light sensor like an LDR could be used to control this streetlight.

                                                                            Introduction to Electronics and Circuits  51

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