Elenco Snaptricity&reg - Manual (Page 48)

1A
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WARNING: Moving parts. Do not
touch the fan or motor during operation.
!
WARNING: Do not
lean over the motor.
3-Position Switch (II) Project #38
Educational Corner:
The electricity supplied to your
home and school by your local
electric company is not a constant
voltage like that from a battery. It
averages about 120V but is
constantly changing, due to the
design of the generators that
produce it. This is not a problem,
since all equipment that uses it
accounts for this change. Electrical current that is changing
is called an
alternating current ,
or AC . Because of this, the power
from the electric company is also
called AC power. An electrical
signal that is constant and
unchanging is called a
direct
current , or DC . The power from a
battery is also called DC power.
Electric Paths
1A
-47-
Push the press switch (S2) to turn on the right lamp (L4)
and use the slide switches (S5) to control the other parts.
The meter measures the circuit current.
Operation
This circuit uses both slide switches to simulate a larger
switch controlling many things.
This circuit has 3 lamps and 1 motor (M1). When the press
switch (S2) is pushed, either 1 or 3 of these will always be
on - you can’t set the slide switches to control more or less.
Description
Build the circuit and set the meter (M5) to the 1A scale.
Assembly
A “ blackout ” occurs when part of a city is cut off from the power plants supplying
it with electricity. The city will appear “black” from the air at night, since there are
no electric lights on. This is usually due to accidents or storms, but is also done
to confuse attacking bombers during war.
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