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Page 64 - CT&AI_CLasa_7_Part_1
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    Electricity:

                                                                             Circuits and their

                                     3                                            Components

                                               computational thinking quest

                    Tick ( ) the correct option.
                      1.  You  connect  a small buzzer to  a battery,               (c)   Only L  glows — S  must control L
                                                                                             1
                                                                                                       2
                                                                                                                      1
                         and it only works when the red wire is on the                 directly.
                         (+) side. Then you connect a light bulb, and               (d)   Neither glows — both switches
                         it  works no matter  which way  you  turn the                 must be ON for any lamp to glow.
                         battery. Why is the bulb different?               3.  In a simple circuit consisting of a battery, a
                                                  (Abstract Thinking)
                                                                              bulb, and wires, what happens if you add a
                                (a)   The bulb contains simpler internal      second  battery  in the correct orientation?

                                   components compared to the                                         (Abstract Thinking)
                                   buzzer.
                                                                                      Bulb
                                (b)   The bulb does not care about the
                                   direction of current (polarity).                  Switch

                                (c)  The bulb has a stronger battery.

                                (d)  The bulb is made of plastic.

                      2.  Lamp L  is in series with switch S , and lamp L
                                1
                                                                   2
                                                       2
                         is in series with switch S . Both branches share                     Battery
                                               1
                         the same battery. Analyse all the combinations
                         and predict which lamp(s) glow.                            (a)  The bulb will glow brighter.
                         If S  is ON and S  is OFF, which lamp(s) glow —            (b)  The bulb will get dimmer.
                            1           2
                         and why does the state of S  NOT affect L ?
                                                   2            2
                                                (Pattern Recognition)               (c)  The current will stop flowing.

                                (a)   Both L  and L  glow — any closed              (d)  The wires will turn into insulators.
                                         1
                                               2
                                   switch powers the whole circuit.        4.  A student builds a circuit correctly — battery
                                                                              is charged, bulb is working, switch is closed.
                                (b)  Only L  glows — S  closes L 's
                                         2         1        2                 However, he forgot to strip the rubber insulation
                                   branch; S  is open so L 's branch          from the ends of the connecting copper wires
                                            2           1
                                   has no current.                            before attaching them  to the  terminals. He
                                                                              closes the switch but the lamp does not glow.

                     62        Computational Thinking-7 (Science)

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