Elenco Snaptricity&reg - Manual (Page 87)

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!
WARNING: Moving parts. Do not touch
the fan or motor during operation.
!
WARNING: Do not
lean over the motor.
Power Light Regulator Project #77
Educational Corner:
Now set the top slide switch to position C (disabling the
motor) and the bottom slide switch to position B (enabling
the second lamp). While holding down the press switch, flip
the top slide switch to position B - the motor may need a
push to start. Now release the press switch and push it
again - the motor starts without a push.
Why can’t the motor start as easily when the lamps are
already on? The lamps have more resistance when they
are bright, and the motor needs a higher current to start
spinning. When the lamps start dark, more current flows
until they warm up. This extra current enables the motor to
get going.
Electric Paths
+
1A
Push the press switch (S2); at least one lamp (L4) lights
and the meter reads the current. The slide switches (S5)
add the other lamp and motor to the circuit.
Operation
Build the circuit and set the meter (M5) to the 1A scale.
Leave the fan off the motor (M1).
Assembly
+
1A