Elenco Circuit Maker Skill Builder 125 - Manual (Page 16)

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Project #9 Spin & Dim
Project #10 Balanced Buddies
!
WARNING: Moving parts. Do not touch the fan or
motor during operation.
!
WARNING: Moving parts. Do not touch the fan or
motor during operation.
Build the circuit shown on the left.
When you turn on the slide switch (S1), the fan will spin and the lamp
(L1) should turn on. The fan will take a while to start turning due to
inertia. Inertia is the property that tries to keep a body at rest from
moving and tries to keep a moving object from stopping.
The lamp helps protect the motor from getting the full voltage when the
switch is turned on. Part of the voltage goes across the lamp and the
rest goes across the motor. Remove the fan and notice how the lamp
gets dimmer when the motor does not have to spin the fan blade.
The parts are arranged
as a series circuit. You
can swap the locations
of any of the parts
without affecting circuit
operation.
Build the circuit shown on the left.
When you turn on the slide switch (S1), both the fan and the lamp (L1)
should turn on. The fan will take a while to start turning due to inertia.
In this connection, the lamp does not change the current to the motor
(M1). The motor should start a little faster than in Project #9.
Remove the fan and notice how the lamp does not change in
brightness as the motor picks up speed. It has its own path to the
battery (B1).
The parts are arranged as a
parallel circuit. Parallel
circuits are often used in
residential homes so that
turning on one device
doesn’t limit the current to
other devices.
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CM-125_Manual_031514.qxp_CM-125_Manual_031514 4/2/14 12:24 PM Page 16