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9. Electrical conductivity tester
You can use this tester to find out if everyday objects you encounter in life can conduct a current. To do this, connect the object
to terminals A and B. If the lamp lights up, then the object is a conductor, such as a steel knife or an aluminum spoon. If the
lamp doesn't light up, then the object is not a conductor, such as a plastic or wooden spoon. The higher the electrical conduc-
tivity, the lower the resistance.
10. Alternating activation of the lamp and LED
12. Alternating activation of the adjustable lamp and LED
When you turn on the switch 15, only the LED
17
lights up.
Replace the reed switch
When the magnet is placed next to the reed switch 13, the
the switch
15
18
light-bulb
will light up, but LED off.
LED goes out and the lamp turns on.
11. Alternating activation of the fan and LED
13. Alternating activation of the adjustable fan and LED
Replace with
light-bulb 18
with the fan (electric motor
24
Replace the light-bulb
with a propeller) and use the magnet to activate the reed
reed switch
13
switch. You can turn on either the LED or the fan.
connect it to the circuit, you can alternately switch on the LED
or fan.
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13
with the button 14, and turn on
– the LED turns on. If you press the button, the
18
with the electric motor 24, and the
with the button 14. By pressing the button to
14. Lamp with variable brightness
15
and use the magnet to operate the reed switch 13. The brightness of the lamp will change.
Turn on the switch
15. Lamp with variable brightness 2
Replace the reed switch
13
with the button 14. When you press the button, the brightness of the lamp changes.
16. Variable speed fan
15
Turn on the switch
and use the magnet to operate the reed switch 13. The rotation speed of the fan will
change.
17. Adjustable speed fan
Replace the reed
switch 13
with the button 14. When you press the button, the speed of the fan changes.
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