Data Sheet

-22-
12. Parts Connected in Series
Build the circuit to the left. When the switch (62) is ON, the
same current will ow through the motor (95) then through
the lamp (76) and both will be active. When the switch (62) is
OFF, the circuit is open and current will be zero, so everything
will stop. Notice that the fan spins slower in this circuit than
in project #6. This is because the lamp (76) has resistance
so when put in series with the motor (95), it limits the current
owing in the circuit.
13. Inertia
Replace the switch (62) with the momentary switch (61).
Press the press switch (61) to make fan spin and the lamp
(76) light. Release the press switch (61) and the fan will keep
spinning, 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.
14. Parts Connected in Parallel
Build the circuit on the left and turn ON with the switch (62).
The fan will start spinning & the lamp (76) will be on as well.
Notice that the fan spins faster in this circuit than in project
#12. This is because the lamp (76) and motor (95) in this
circuit are in parallel, allowing each to have separate paths for
current ow. Thus the resistance in the lamp (76) does not limit
the current ow through the motor (95).
WARNING: Moving parts. Do not touch
the fan or motor during operation. Do
not lean over the motor.
!
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