Elenco Snap Circuits® Home Learning - Manual (Page 32)

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Materials List
Build the circuit as shown. Place it where there will be no room light hitting the photoresistor (RP), such as under a piece of paper,
or under the table. Turn on the switch. The lamp (L1) will be bright and one song may play, but then there should be no sound.
What happened? _______________________________________________________________________________________
Take a small mirror and hold it over the lamp and photoresistor (RP). Try and reflect the light from the lamp into the top RP hole.
What happened? ______________________________________________________________________________________
You have made a reflection detector.
What happens as more light is reflected onto the photoresistor? _________________________________________________
Use a white card or piece of paper to reflect light instead of the mirror. What do you think will happen?
______________________________________________________________________________________________________
Try the card as a reflector. What happened? ________________________________________________________________
Optional extension activities.
Activity 24
Reflection Detector
1 2-Snap Wire
2 3-Snap Wires
1 4-Snap Wire
1 5-Snap Wire
1 Battery Holder (B1)
1 Lamp (L1)
1 Photoresistor (RP) 1 Slide Switch (S1)
1 Speaker (SP)
1 Music Integrated Circuit (U1)
1 Red Jumper Wire
1 Black Jumper Wire
1 Small mirror (not included)
(STANDING)