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29
Project #63
When building the circuit, be sure to position the motor (M1) with the
positive (+) side snapped to the 470mF capacitor (C5). Turn on the slide
switch (S1), nothing will happen. It is a motor speed detector, and the
motor isn’t moving. Watch the LED (D2) and give the motor a good spin
CLOCKWISE with your ngers (don’t use the fan blade); you should
see a ash of light. The faster you spin the motor, the brighter the ash
will be. As a game, see who can make the brightest ash.
Now try spinning the motor in the opposite direction (counter-clockwise)
and see how bright the ash is — it won’t ash at all because the
electricity it produces, ows in the wrong direction and won’t activate
the diode. Flip the motor around (positive (+) side snapped to the
3-snap wire) and try again. Now the LED lights only if you spin the
motor counter-clockwise.
Motor Speed Detector
OBJECTIVE: To show how to make electricity in one direction.
Project #64
Turn on the slide switch (S1), nothing will happen. Turn the motor
(M1) slowly with your ngers (don’t use the fan blade), you will hear a
clicking that sounds like an old-time manual typewriter keystrokes. Spin
the motor faster and the clicking speeds up accordingly.
This circuit works the same if you spin the motor in either direction
(unlike the Motor Speed Detector project).
By spinning the motor with your ngers, the physical effort you exert
is converted into electricity. In electric power plants, steam is used to
spin large motors like this, and the electricity produced is used to run
everything in your town.
Old-Style Typewriter
OBJECTIVE: To show how a generator works.
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