Manual

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31. Inertia
Build the circuit, press the switch (62), the fan blade
(60) of the motor (95) will start running while the lamp
(76) is on. Release the press switch (61) and the fan will
keep spinning for a short while, but the lamp (76) will turn
off immediately. This circuit demonstrates the concept
of Inertia: a property of matter by which it continues in
its existing state of rest or uniform motion in a straight
line, unless that state is changed by an external force.
The fan has inertia but the lamp does not.
32. Motor and Alarm in Series
Build the circuit, press the switch (62) and you will
hear the alarm (78) faintly. The motor (95) will be
off. Because the motor (95) and the alarm (78)
are in series, and thus see the same current, the
resistance in the alarm (78) limits the current
through the motor (95) preventing it from spinning.
Motor shaft cap
Fan
Motor top
Motor
Fan
Assembly
WARNING: Moving parts. Do not touch
the fan or motor during operation. Do
not lean over the motor.
!